Date: 01-21-2015

Case Style: Department of Homeland Security v. Robert J. MacLean

Case Number: 13-894

Judge: Roberts

Court: Supreme Court of the United States on writ of certioari to the United states Court of Appeals for the Federal Circuit

Plaintiff's Attorney:

Defendant's Attorney:

Description: Federal law generally provides whistleblower protections to an employee who discloses information revealing “any violation of any law, rule, or regulation,” or “a substantial and specific danger to public health or safety.” 5
U. S. C. §2302(b)(8)(A). An exception exists, however, for disclosures that are “specifically prohibited by law.” Ibid. Here, a federal air marshal publicly disclosed that the Transportation Security Administration (TSA) had decided to cut costs by removing air marshals from certain long-distance flights. The question presented is whether that disclosure was “specifically prohibited by law.”
I
A
In 2002, Congress enacted the Homeland Security Act,116 Stat. 2135. As relevant here, that Act provides that the TSA “shall prescribe regulations prohibiting the disclosure of information obtained or developed in carryingout security . . . if the Under Secretary decides that disclosing the information would . . . be detrimental to the
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security of transportation.” 49 U. S. C. §114(r)(1)(C).
Around the same time, the TSA promulgated regulations prohibiting the unauthorized disclosure of what it called “sensitive security information.” See 67 Fed. Reg.8351 (2002). The regulations described 18 categories of sensitive security information, including “[s]pecific details of aviation security measures . . . [such as] information concerning specific numbers of Federal Air Marshals,deployments or missions, and the methods involved insuch operations.” 49 CFR §1520.7(j) (2002). Sensitive security information is not classified, so the TSA can shareit with individuals who do not have a security clearance,such as airport employees. Compare Exec. Order 13526, §4.1, 3 CFR 298, 314–315 (2009 Comp.), with 49 CFR§1520.11(c) (2013).
B Robert J. MacLean became a federal air marshal for the TSA in 2001. In that role, MacLean was assigned to protect passenger flights from potential hijackings. See 49
U. S. C. §44917(a).
On July 26, 2003, the Department of Homeland Security (DHS) issued a confidential advisory about a potential hijacking plot. The advisory said that members of the terrorist group al Qaeda were planning to attack passenger flights, and that they “considered suicide hijackings and bombings as the most promising methods to destroy aircraft in flight, as well as to strike ground targets.” App.
16. The advisory identified a number of potential targets,including the United Kingdom, Italy, Australia, and the east coast of the United States. Finally, the advisorywarned that at least one of the attacks “could be executed by the end of the summer 2003.” Ibid.
The TSA soon summoned all air marshals (including MacLean) for face-to-face briefings about the hijacking plot. During MacLean’s briefing, a TSA official told him
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that the hijackers were planning to “smuggle weapons incamera equipment or children’s toys through foreignsecurity,” and then “fly into the United States . . . into an airport that didn’t require them to be screened.” Id., at 92. The hijackers would then board U. S. flights, “overpower the crew or the Air Marshals and . . . fly the planes into East Coast targets.” Id., at 93.
A few days after the briefing, MacLean received fromthe TSA a text message cancelling all overnight missionsfrom Las Vegas until early August. MacLean, who was stationed in Las Vegas, believed that cancelling those missions during a hijacking alert was dangerous. He also believed that the cancellations were illegal, given that federal law required the TSA to put an air marshal on every flight that “present[s] high security risks,” 49
U. S. C. §44917(a)(2), and provided that “nonstop, longdistance flights, such as those targeted on September 11, 2001, should be a priority,” §44917(b). See App. 95, 99,
101.
MacLean therefore asked a supervisor why the TSA hadcanceled the missions. The supervisor responded that theTSA wanted “to save money on hotel costs because there was no more money in the budget.” Id., at 95. MacLean also called the DHS Inspector General’s Office to reportthe cancellations. But a special agent in that office toldhim there was “nothing that could be done.” Id., at 97.
Unwilling to accept those responses, MacLean contacted an MSNBC reporter and told him about the canceled missions. In turn, the reporter published a story aboutthe TSA’s decision, titled “Air Marshals pulled from keyflights.” Id., at 36. The story reported that air marshals would “no longer be covering cross-country or internationalflights” because the agency did not want them “to incur the expense of staying overnight in hotels.” Ibid. The story also reported that the cancellations were “particularly disturbing to some” because they “coincide[d] with a
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new high-level hijacking threat issued by the Department of Homeland Security.” Id., at 37.
After MSNBC published the story, several Members of Congress criticized the cancellations. Within 24 hours, the TSA reversed its decision and put air marshals back on the flights. Id., at 50.
At first, the TSA did not know that MacLean was the source of the disclosure. In September 2004, however,MacLean appeared on NBC Nightly News to criticize theTSA’s dress code for air marshals, which he believed made them too easy to identify. Although MacLean appeared in disguise, several co-workers recognized his voice, and the TSA began investigating the appearance. During thatinvestigation, MacLean admitted that he had disclosed the text message back in 2003. Consequently, in April 2006,the TSA fired MacLean for disclosing sensitive securityinformation without authorization.
MacLean challenged his firing before the Merit SystemsProtection Board, arguing in relevant part that his disclosure was protected whistleblowing activity under 5
U. S. C. §2302(b)(8)(A). The Board held that MacLean did not qualify for protection under that statute, however, because his disclosure was “specifically prohibited by law.” 116 MSPR 562, 569–572 (2011).
The Court of Appeals for the Federal Circuit vacated theBoard’s decision. 714 F. 3d 1301 (2013). The parties had agreed that, in order for MacLean’s disclosure to be “specifically prohibited by law,” it must have been “prohibited by a statute rather than by a regulation.” Id., at 1308 (emphasis added). Thus, the issue before the court was whether the statute authorizing the TSA’s regulations—now codified at 49 U. S. C. §114(r)(1)—“specifically prohibited” MacLean’s disclosure. 714 F. 3d, at 1308.*
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*This statute has a complicated history. It was codified at 49 U. S. C. §40119(b)(1) when the TSA initially promulgated its regulations on
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The court first held that Section 114(r)(1) was not aprohibition. The statute did “not expressly prohibit employee disclosures,” the court explained, but instead empowered the TSA to “prescribe regulations prohibiting disclosure[s]” if the TSA decided that disclosing the information would harm public safety. Id., at 1309. The court therefore concluded that MacLean’s disclosure was prohibited by a regulation, which the parties had agreed could not be a “law” under Section 2302(b)(8)(A). Ibid.
The court then held that, even if Section 114(r)(1) werea prohibition, it was not “sufficiently specific.” Ibid. The court explained that a law is sufficiently specific only if it “requires that matters be withheld from the public as to leave no discretion on the issue, or . . . establishes particular criteria for withholding or refers to particular types of matters to be withheld.” Ibid. (quoting S. Rep. No. 95–969 (1978)). And Section 114(r)(1) did not meet that testbecause it “provide[d] only general criteria for withholdinginformation and [gave] some discretion to the [TSA] tofashion regulations for prohibiting disclosure.” 714 F. 3d, at 1309. The court accordingly vacated the Board’s decision and remanded for a determination of whether MacLean’s disclosure met the other requirements under Section 2302(b)(8)(A). Id., at 1310–1311.
We granted certiorari. 572 U. S. ___ (2014).
II Section 2302(b)(8) provides, in relevant part, that afederal agency may not take “a personnel action with respect to any employee or applicant for employment because of —————— sensitive security information. It was codified at §114(s)(1) when MacLean disclosed the text message to MSNBC. And it is now codified at §114(r)(1). The Federal Circuit referred to §40119(b)(1) in its opinion. Because the statute has remained identical in all relevant respects, however, we and the parties refer to the current version.
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“(A) any disclosure of information by an employee orapplicant which the employee or applicant reasonably believes evidences “(i) any violation of any law, rule, or regulation, or“(ii) gross mismanagement, a gross waste of funds, an abuse of authority, or a substantial and specific danger to public health or safety,“if such disclosure is not specifically prohibited by law and if such information is not specifically required by Executive order to be kept secret in the interest of national defense or the conduct of foreign affairs.”
The Government argues that this whistleblower statutedoes not protect MacLean because his disclosure regardingthe canceled missions was “specifically prohibited by law” in two ways. First, the Government argues that the disclosure was specifically prohibited by the TSA’s regulations on sensitive security information: 49 CFR §§1520.5(a)–(b), 1520.7(j) (2003). Second, the Government argues that the disclosure was specifically prohibited by 49 U. S. C. §114(r)(1), which authorized the TSA to promulgate those regulations. We address each argument in turn.
A 1
In 2003, the TSA’s regulations prohibited the disclosure of “[s]pecific details of aviation security measures . . . [such as] information concerning specific numbers of Federal AirMarshals, deployments or missions, and the methodsinvolved in such operations.” 49 CFR §1520.7(j). Mac-Lean does not dispute before this Court that the TSA’s regulations prohibited his disclosure regarding the canceled missions. Thus, the question here is whether a disclosure that is specifically prohibited by regulation is also “specifically prohibited by law” under Section 2302(b)(8)(A). (Emphasis added.)
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The answer is no. Throughout Section 2302, Congressrepeatedly used the phrase “law, rule, or regulation.” For example, Section 2302(b)(1)(E) prohibits a federal agencyfrom discriminating against an employee “on the basis of marital status or political affiliation, as prohibited underany law, rule, or regulation.” For another example, Section 2302(b)(6) prohibits an agency from “grant[ing] any preference or advantage not authorized by law, rule, or regulation.” And for a third example, Section 2302(b)(9)(A) prohibits an agency from retaliating against an employee for “the exercise of any appeal, complaint, or grievance right granted by any law, rule, or regulation.”
In contrast, Congress did not use the phrase “law, rule,or regulation” in the statutory language at issue here; it used the word “law” standing alone. That is significant because Congress generally acts intentionally when it usesparticular language in one section of a statute but omits it in another. Russello v. United States, 464 U. S. 16, 23 (1983). Thus, Congress’s choice to say “specifically prohibited by law” rather than “specifically prohibited by law,rule, or regulation” suggests that Congress meant to exclude rules and regulations.
The interpretive canon that Congress acts intentionallywhen it omits language included elsewhere applies withparticular force here for two reasons. First, Congress used“law” and “law, rule, or regulation” in close proximity—indeed, in the same sentence. §2302(b)(8)(A) (protecting the disclosure of “any violation of any law, rule, or regulation . . . if such disclosure is not specifically prohibited by law”). Second, Congress used the broader phrase “law,rule, or regulation” repeatedly—nine times in Section 2302alone. See §§2302(a)(2)(D)(i), (b)(1)(E), (b)(6), (b)(8)(A)(i),(b)(8)(B)(i), (b)(9)(A), (b)(12), (b)(13), (d)(5). Those two aspects of the whistleblower statute make Con-gress’s choice to use the narrower word “law” seem quite deliberate.
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We drew the same inference in Department of Treasury, IRS v. FLRA, 494 U. S. 922 (1990). There, the Government argued that the word “laws” in one section of the Civil Service Reform Act of 1978 meant the same thing as the phrase “law, rule, or regulation” in another section ofthe Act. Id., at 931. We rejected that argument as “simply contrary to any reasonable interpretation of the text.” Id., at 932. Indeed, we held that a statute that referred to “laws” in one section and “law, rule, or regulation” in another “cannot, unless we abandon all pretense at precise communication, be deemed to mean the same thing inboth places.” Ibid. That inference is even more compelling here, because the statute refers to “law” and “law,rule, or regulation” in the same sentence, rather thanseveral sections apart.
Another part of the statutory text points the same way.After creating an exception for disclosures “specificallyprohibited by law,” Section 2302(b)(8)(A) goes on to create a second exception for information “specifically requiredby Executive order to be kept secret in the interest ofnational defense or the conduct of foreign affairs.” This exception is limited to action taken directly by the President. That suggests that the word “law” in the only otherexception is limited to actions by Congress—after all, itwould be unusual for the first exception to include actiontaken by executive agencies, when the second exception requires action by the President himself.
In addition, a broad interpretation of the word “law”could defeat the purpose of the whistleblower statute. If “law” included agency rules and regulations, then an agency could insulate itself from the scope of Section 2302(b)(8)(A) merely by promulgating a regulation that“specifically prohibited” whistleblowing. But Congresspassed the whistleblower statute precisely because it did not trust agencies to regulate whistleblowers within theirranks. Thus, it is unlikely that Congress meant to include
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rules and regulations within the word “law.”
2 The Government admits that some regulations falloutside the word “law” as used in Section 2302(b)(8)(A).But, the Government says, that does not mean that all regulations are excluded. The Government suggests twointerpretations that would distinguish “law” from “law, rule, or regulation,” but would still allow the word “law” to subsume the TSA’s regulations on sensitive securityinformation. First, the Government argues that the word “law” includes all regulations that have the “force and effect of law” (i.e., legislative regulations), while excluding those that do not (e.g., interpretive rules). Brief for Petitioner 19–22. The Government bases this argument on our decision in Chrysler Corp. v. Brown, 441 U. S. 281 (1979). There, we held that legislative regulations generally fall within the meaning of the word “law,” and that it would take a “clear showing of contrary legislative intent” beforewe concluded otherwise. Id., at 295–296. Thus, because the TSA’s regulations have the force and effect of law, the Government says that they should qualify as “law” underthe statute. The Government’s description of Chrysler is accurate enough. But Congress’s use of the word “law,” in close connection with the phrase “law, rule, or regulation,” provides the necessary “clear showing” that “law” does notinclude regulations. Indeed, using “law” and “law, rule, orregulation” in the same sentence would be a very obscureway of drawing the Government’s nuanced distinctionbetween different types of regulations. Had Congresswanted to draw that distinction, there were far easier and clearer ways to do so. For example, at the time Congresspassed Section 2302(b)(8)(A), another federal statute defined the words “regulatory order” to include a “rule or
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regulation, if it has the force and effect of law.” 7 U. S. C. §450c(a) (1976 ed.). Likewise, another federal statute defined the words “State law” to include “all laws, decisions, rules, regulations, or other State action having the effect of law.” 29 U. S. C. §1144(c)(1) (1976 ed.). As those examples show, Congress knew how to distinguish between regulations that had the force and effect of law and those that did not, but chose not to do so in Section 2302(b)(8)(A).
Second, the Government argues that the word “law”includes at least those regulations that were “promulgatedpursuant to an express congressional directive.” Brief for Petitioner 21. Outside of this case, however, the Government was unable to find a single example of the word“law” being used in that way. Not a single dictionarydefinition, not a single statute, not a single case. The Government’s interpretation happens to fit this case precisely, but it needs more than that to recommend it.
Although the Government argues here that the word“law” includes rules and regulations, it definitively rejected that argument in the Court of Appeals. For example, the Government’s brief accepted that the word “law”meant “legislative enactment,” and said that the “onlydispute” was whether 49 U. S. C. §114(r)(1) “serve[d] asthat legislative enactment.” Brief for Respondent in No.11–3231 (CA Fed.), pp. 46–47. Then, at oral argument, a judge asked the Government’s attorney the following question: “I thought I understood your brief to concede that [the word “law”] can’t be a rule or regulation, it means statute. Am I wrong?” The Government’s attorneyresponded: “You’re not wrong your honor. I’ll be as clear as I can. ‘Specifically prohibited by law’ here means statute.” Oral Arg. Audio in No. 11–3231, at 22:42–23:03; see also id., at 29:57–30:03 (“Now, as we’ve been discussing here, we’re not saying here that [the word “law”] needs to encompass regulations. We’re saying statute.”). Those
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concessions reinforce our conclusion that the Government’s proposed interpretations are unpersuasive.
In sum, when Congress used the phrase “specifically prohibited by law” instead of “specifically prohibited by law, rule, or regulation,” it meant to exclude rules andregulations. We therefore hold that the TSA’s regulationsdo not qualify as “law” for purposes of Section 2302(b)(8)(A).
B We next consider whether MacLean’s disclosure regarding the canceled missions was “specifically prohibited” by 49 U. S. C. §114(r)(1) itself. As relevant here, that statute provides that the TSA “shall prescribe regulations prohibiting the disclosure of information obtained or developed in carrying out security . . . if the Under Secretary decides that disclosing the information would . . . be detrimental to the security of transportation.” §114(r)(1)(C).This statute does not prohibit anything. On the contrary, it authorizes something—it authorizes the UnderSecretary to “prescribe regulations.” Thus, by its termsSection 114(r)(1) did not prohibit the disclosure at issuehere. The Government responds that Section 114(r)(1) didprohibit MacLean’s disclosure by imposing a “legislative mandate” on the TSA to promulgate regulations to thateffect. See Brief for Petitioner 28, 33; see also post, at 2–3 (SOTOMAYOR, J., dissenting). But the Government pushes the statute too far. Section 114(r)(1) says that the TSA shall prohibit disclosures only “if the Under Secretary decides that disclosing the information would . . . be detrimental to the security of transportation.” §114(r)(1)(C)(emphasis added). That language affords substantial discretion to the TSA in deciding whether to prohibit any particular disclosure. The dissent tries to downplay the scope of that discre12
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tion, viewing it as the almost ministerial task of “identifying whether a particular piece of information falls withinthe scope of Congress’ command.” Post, at 3. But determining which documents meet the statutory standard of “detrimental to the security of transportation” requires the exercise of considerable judgment. For example, the Government says that Section 114(r)(1) requires the Under Secretary to prohibit disclosures like MacLean’s. The Government also says, however, that the statute does not require the Under Secretary to prohibit an employee from disclosing that “federal air marshals will be absent fromimportant flights, but declining to specify which flights.” Reply Brief 23. That fine-grained distinction comes not from Section 114(r)(1) itself, but from the Under Secretary’s exercise of discretion. It is the TSA’s regulations—not the statute—that prohibited MacLean’s disclosure.And as the dissent agrees, a regulation does not count as“law” under the whistleblower statute. See post, at 1.
The Government insists, however, that this grant ofdiscretion does not make Section 114(r)(1) any less of aprohibition. In support, the Government relies on Administrator, FAA v. Robertson, 422 U. S. 255 (1975). That case involved the Freedom of Information Act (FOIA), which requires federal agencies to disclose information upon request unless, among other things, the information is “specifically exempted from disclosure by statute.” 5
U. S. C. §552(b)(3). In Robertson, we held that the Federal Aviation Act of 1958 was one such statute, because it gave the Federal Aviation Administration (FAA) “a broad degree of discretion” in deciding whether to disclose or withhold information. 422 U. S., at 266.
The Government tries to analogize that case to this one. In Robertson, the Government says, the FAA’s discretion whether to disclose information did not preclude a finding that the information was “specifically exempted” from disclosure by statute. So too here, the Government says,
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the TSA’s discretion whether to prohibit disclosure ofinformation does not preclude a finding that the information is “specifically prohibited” from disclosure bySection 114(r)(1). See Brief for Petitioner 30.
This analogy fails. FOIA and Section 2302(b)(8)(A)differ in an important way: The provision of FOIA at issueinvolves information that is “exempted” from disclosure, while Section 2302(b)(8)(A) involves information that is “prohibited” from disclosure.
A statute that exempts information from mandatory disclosure may nonetheless give the agency discretion torelease that exempt information to the public. In such a case, the agency’s exercise of discretion has no effect onwhether the information is “exempted from disclosure by statute”—it remains exempt whatever the agency chooses to do.
The situation is different when it comes to a statute giving an agency discretion to prohibit the disclosure ofinformation. The information is not prohibited from disclosure by statute regardless of what the agency does. It is the agency’s exercise of discretion that determineswhether there is a prohibition at all. Thus, when Section 114(r)(1) gave the TSA the discretion to prohibit the disclosure of information, the statute did not create a prohibition—it gave the TSA the power to create one. And because Section 114(r)(1) did not create a prohibition,MacLean’s disclosure was not “prohibited by law” under Section 2302(b)(8)(A), but only by a regulation issued inthe TSA’s discretion.
In any event, Robertson was a case about FOIA, not Section 2302, and our analysis there depended on twoFOIA-specific factors that are not present here. First, we examined the legislative history of FOIA and determined that Congress did not intend that statute to affect laws like the Federal Aviation Act. 422 U. S., at 263–265. In particular, we noted that the Civil Aeronautics Board had
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expressed its view during congressional hearings that theFederal Aviation Act qualified as an exempting statute under FOIA, and that “no question was raised or challenge made” to the agency’s view. Id., at 264–265. But that legislative history can have no effect on our analysis ofSection 2302(b)(8)(A).
Second, we said that the Federal Aviation Act could fail to qualify as an exempting statute only if we read FOIA“as repealing by implication all existing statutes whichrestrict public access to specific Government records.” Id., at 265 (internal quotation marks omitted). Then, relyingon the presumption that “repeals by implication are disfavored,” we rejected that interpretation of FOIA. But the presumption against implied repeals has no relevance here. Saying that Section 114(r)(1) is not a prohibitionunder the whistleblower statute is not the same as saying that the whistleblower statute implicitly repealed Section 114(r)(1). On the contrary, Section 114(r)(1) remains inforce by allowing the TSA to deny FOIA requests and prohibit employee disclosures that do not qualify for whistleblower protection under Section 2302(b)(8)(A).
Ultimately, FOIA and Section 2302(b)(8)(A) are different statutes—they have different language, different histories,and were enacted in different contexts. Our interpretation of one, therefore, has no impact whatsoever on our interpretation of the other.
III Finally, the Government warns that providing whistle-blower protection to individuals like MacLean would “gravely endanger public safety.” Brief for Petitioner 38. That protection, the Government argues, would make the confidentiality of sensitive security information depend onthe idiosyncratic judgment of each of the TSA’s 60,000 employees. Id., at 37. And those employees will “most likely lack access to all of the information that led the TSA
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to make particular security decisions.” Id., at 38. Thus, the Government says, we should conclude that Congressdid not intend for Section 2302(b)(8)(A) to cover disclosures like MacLean’s.
Those concerns are legitimate. But they are concernsthat must be addressed by Congress or the President, rather than by this Court. Congress could, for example, amend Section 114(r)(1) so that the TSA’s prohibitions on disclosure override the whistleblower protections in Section 2302(b)(8)(A)—just as those prohibitions currentlyoverride FOIA. See §114(r)(1) (authorizing the TSA toprohibit disclosures “[n]otwithstanding section 552 of title 5”); see also 10 U. S. C. §2640(h) (“the Secretary of Defense may (notwithstanding any other provision of law) withhold from public disclosure safety-related information that isprovided to the Secretary voluntarily by an air carrier forthe purposes of this section”). Congress could also exempt the TSA from the requirements of Section 2302(b)(8)(A) entirely, as Congress has already done for the Federal Bureau of Investigation, the Central Intelligence Agency,the Defense Intelligence Agency, the National Geospatial-Intelligence Agency, the National Security Agency, the Office of the Director of National Intelligence, and theNational Reconnaissance Office. See 5 U. S. C. §2302(a)(2)(C)(ii)(I).
Likewise, the President could prohibit the disclosure of sensitive security information by Executive order. Indeed, the Government suggested at oral argument that the President could “entirely duplicate” the regulations thatthe TSA has issued under Section 114(r)(1). Tr. of Oral Arg. 16–20. Such an action would undoubtedly create anexception to the whistleblower protections found in Section 2302(b)(8)(A).
Although Congress and the President each has the power to address the Government’s concerns, neither has done so. It is not our role to do so for them.
16 DEPARTMENT OF HOMELAND SECURITY v. MACLEAN Opinion of the Court The judgment of the United States Court of Appeals for the Federal Circuit is
Affirmed.
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SOTOMAYOR, J., dissenting
SUPREME COURT OF THE UNITED STATES
No. 13–894
DEPARTMENT OF HOMELAND SECURITY,
PETITIONER v. ROBERT J. MACLEAN
ON WRIT OF CERTIORARI TO THE UNITED STATES COURT OF
APPEALS FOR THE FEDERAL CIRCUIT
[January 21, 2015]
JUSTICE SOTOMAYOR, with whom JUSTICE KENNEDY joins, dissenting.
I agree with much of the Court’s opinion. I have no qualms with the Court’s conclusion that the phrase “specifically prohibited by law,” as used in the Whistleblower Protection Act of 1989 (WPA), 5 U. S. C. §2302(b)(8)(A), does not encompass disclosures prohibited only by regulation. See ante, at 7. Nor do I see any problem in the distinction the Court draws between statutes that prohibitinformation from being disclosed, the violation of which may preclude application of the WPA, and statutes that simply exempt information from otherwise-applicabledisclosure requirements, which do not trigger the WPA’s“prohibited by law” exception. See ante, at 12–13.
I part ways with the Court, however, when it concludesthat 49 U. S. C. §114(r)(1) does not itself prohibit the type of disclosure at issue here—the release of information regarding the absence of federal air marshals on overnightflights. Ante, at 11. That statute provides, in relevantpart, that the Transportation Security Administration (TSA) “shall prescribe regulations prohibiting the disclosure of information obtained or developed in carrying out security . . . if the Under Secretary decides that disclosing the information would . . . be detrimental to the security oftransportation.” §114(r)(1) (emphasis added).
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The Court reasons, first, that Section 114(r)(1) does not “prohibit anything,” but instead simply “authorizes” the TSA to prescribe regulations. Ante, at 11. But this contention overlooks the statute’s use of the word “shall,” which, as we have observed, “generally means ‘must.’” Gutierrez de Martinez v. Lamagno, 515 U. S. 417, 432, n. 9 (1995); see also, e.g., Federal. Express Corp. v. Holowecki, 552 U. S. 389, 400 (2008) (“Congress’ use of the term ‘shall’ indicates an intent to ‘impose discretionless obligations’”)(some internal quotation marks omitted)); A. Scalia & B.Garner, Reading Law: The Interpretation of Legal Texts 114 (2012) (“[W]hen the word shall can reasonably read asmandatory, it ought to be so read”). Section 114(r)(1) doesnot merely authorize the TSA to promulgate regulations; itdirects it to do so, and describes what those regulations must accomplish.
The Court focuses, second, on the fact that Section 114(r) authorizes the TSA to “‘decid[e]’” whether the disclosure of a particular item of information would in fact be “‘detrimental to the security of transportation.’” Ante, at 11–12 (emphasis deleted). I certainly agree that thislanguage vests some discretion in the agency.1 But the ——————
1The Court does not address respondent’s alternative argument, accepted by the Court of Appeals below, that Section 114(r)(1) describesthe information encompassed in its prohibitory scope with insufficient particularity to qualify the disclosure here as “specifically prohibited by law” within the meaning of the WPA. Some of the legislative history ofthe WPA linked its specificity requirement to the criteria established inExemption 3 of the Freedom of Information Act, 5 U. S. C. §552(b)(3),and the Court of Appeals applied this standard. See 714 F. 3d 1301, 1309 (CA Fed. 2013); see also S. Rep. No. 95–969, pp. 21–22 (1978). MacLean has offered no argument that a WPA anti-disclosure statute must define the relevant category of information with any greaterdegree of particularity. Assuming the Exemption 3 standard is applicable, I note that Section 114(r) is at least as “specific” as the statutoryprovisions we have previously held to satisfy Exemption 3’s requirements. See, e.g., Department of Justice v. Julian, 486 U. S. 1, 9 (1988) (holding that provisions of Federal Rule of Criminal Procedure
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agency is required to prevent the disclosure of any information it determines is within Congress’ prohibition; itsdiscretion pertains only to identifying whether a particular piece of information falls within the scope of Congress’ command. In concluding that such residual agency discretion deprives Section 114(r) of prohibitory effect, the Court overlooks the degree of agency involvement that is necessary in the administration of many antidisclosure statutes. Congress cannot be expected to identify with particularity each individual document or datum the release of which it wants to preclude. Often, it will have to leave to an agency or other enforcing authority the tasks of defining—perhaps through regulations—exactly what type ofinformation falls within the scope of the congressional prohibition, and of determining whether a particular item of information fits the bill. The enforcing authority may,as the Court puts it, sometimes be required to make some “fine-grained distinction[s]” in fulfilling this charge, ante, at 12, but that does not change the fact that Congress itself is the source of the prohibition on disclosure.2
Indeed, Congress appears to have anticipated the need for agency involvement in the interpretation and enforce——————
32(c)(3)(A) and former 18 U. S. C. §4208(c)(1982 ed.) prohibiting disclosure of portions of presentence reports “relat[ed] to confidential sources,diagnostic opinions, and other information that may cause harm to the defendant or to third parties” could justify withholding under Exemption 3 (emphasis added)). 2For the same reasons, the agency’s decision that a disclosure contravened a statute may not necessarily be determinative in any givenWPA case: Although an agency may no doubt receive deference in theinterpretation and implementation of a prohibitory statute, ultimatelyWPA protection will not apply if the agency improperly concluded thata given disclosure was prohibited by that statute. Cf. CIA v. Sims, 471
U. S. 159, 168–181 (1985) (according deference to Central Intelligence Agency’s expertise, but engaging in an extended analysis of whetherthe particular information the agency refused to disclose fell within thescope of the statutory prohibition).
4 DEPARTMENT OF HOMELAND SECURITY v. MACLEAN
SOTOMAYOR, J., dissenting
ment of antidisclosure statutes at the time it enacted the WPA. The Senate Report to the WPA identified only twostatutes the violation of which would preclude whistle-blower protection, the first being Section 102(d)(3) of theNational Security Act of 1947, 61 Stat. 498, which pro- vided that “the Director of Central Intelligence shall be re- sponsible for protecting intelligence sources and methods from unauthorized disclosure.” See S. Rep. No. 95–969, pp. 21–22 (1978). This example clearly suggests Congresscontemplated that a statute directing an agency to protectagainst disclosures and delegating substantial authority tothe agency should nevertheless be deemed to impose the relevant prohibition. Section 114(r)(1)’s delegation to theTSA to “decide” whether the release of particular information would be “detrimental to the security of transportation” likewise simply reflects Congress’ recognition of the inevitable fact that the agency will be tasked, in thefirst instance, with enforcing its statutory mandate.
In sum, with Section 114(r)(1), Congress has requiredagency action that would preclude the release of information “detrimental to the security of transportation.” In so doing, Congress has expressed its clear intent to pro- hibit such disclosures. I would respect its intent, and holdthat a disclosure contravening that mandate is “prohibited by law” within the meaning of the WPA.
Having said all that, I appreciate the narrowness of theCourt’s holding. The Court’s conclusion that Section 114(r) does not itself prohibit any disclosures depends entirely on the statutory language directing the agency to “prescribe regulations,” and providing that the agency will“decid[e]” what information falls within the statue’s purview. See ante, at 11. From all that appears in the majority opinion, then, this case would likely have turned out differently if Section 114(r) instead provided: “The disclosure of information detrimental to the security of transportation is prohibited, and the TSA shall promulgate
5
Cite as: 574 U. S. ____ (2015)
SOTOMAYOR, J., dissenting
regulations to that effect,” or “The Under Secretary shallprescribe regulations prohibiting the disclosure of information detrimental to the security of transportation; and such disclosures are prohibited.” I myself decline to surrender so fully to sheer formalism, especially where transportation security is at issue and there is little disputethat the disclosure of air marshals’ locations is potentiallydangerous and was proscribed by the relevant implementing regulation. In so surrendering, however, the Courtwould appear to have enabled future courts and Con- gresses to avoid easily the consequences of its ruling, and thus to have limited much of the potential for adverse practical effects beyond this case. But in the interim, at least, the Court has left important decisions regarding the disclosure of critical information completely to the whimsof individual employees.
I respectfully dissent.

Outcome: The judgment of the United States Court of Appeals for the Federal Circuit is
Affirmed.

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