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Text: Section 7602(c) does impose an additional constraint on the issuance of summonses to further domestic tax investigations.[2] By its terms, however, it does not apply to the summonses challenged by respondents, for it speaks only to investigations into possible violations of United States revenue laws. Section 7602(c) forbids the issuance of a summons "if a Justice Department referral is in effect" with respect to a person about whom information is sought by means of the summons. At the time of the District Court's decision, no Justice Department referral was in effect with regard to respondents; indeed, the IRS agent seeking the bank records to fulfill Revenue Canada's request said in her affidavit that no domestic tax investigation of any kind was pending. See App. 30. Section 7602(c) therefore does not itself appear to bar enforcement of the summonses at issue here.[3]

The legislative history of § 7602(c) supports this conclusion. Prior to its enactment, we held in United States v. LaSalle National Bank, 437 U.S. 298 (1978), that the IRS may not issue a summons once it has recommended prosecution to the Justice Department, nor may it circumvent this requirement by delaying such a recommendation in order to gather additional information. We based our holding in large part on our finding that "[n]othing in § 7602 or its legislative history suggests that Congress intended the summons authority to broaden the Justice Department's right of criminal litigation discovery or to infringe on the role of the grand jury as a principal tool of criminal accusation." Id., at 312 (citations omitted). When Congress codified the essence of our holding in § 7602(c), it apparently shared our concern about permitting the IRS to encroach upon the rights of potential criminal defendants. The Report of the Senate Finance Committee noted that "the provision is in no way intended to broaden the Justice Department's right of criminal discovery or to infringe on the role of the grand jury as a principal tool of criminal prosecution." S. Rep. No. 97-494, Vol. 1, p. 286 (1982).

This explanation for the restriction embodied in § 7602(c) suggests that Congress did not intend to make the enforcement of a treaty summons contingent upon the foreign tax investigation's not having reached a stage analogous to a Justice Department referral. None of the civil-law countries with whom the United States has tax treaties providing for exchanges of information employ grand juries, and Canada has ceased to use them.[4] Moreover, criminal discovery procedures differ considerably among countries with whom we have such treaties.[5] The concerns that prompted Congress to pass § 7602(c) are therefore not present when the IRS issues summonses at the request of most foreign governments conducting investigations into possible violations of their own tax laws. If Congress had intended § 7602(c) to impose a restriction on the issuance of summonses pursuant to treaty requests parallel to the restriction it expressly imposes on summonses issued by the IRS in connection with domestic tax investigations, it would presumably have offered some reason for extending the sweep of the section beyond its plain language. In addition, Congress would likely have discussed the appropriateness of extending the protections afforded by United States law to citizens of other countries who are not subject to criminal prosecution here, and would doubtless have considered the problems posed by the application of § 7602(c) to requests by treaty partners, in particular the difficulty of determining when a foreign investigation has progressed to a point analogous to a Justice Department referral.[6] Respondents have not directed us, however, to anything in the legislative history of § 7602(c) suggesting that Congress intended it to apply to summonses issued pursuant to treaty requests, or to any reference to the problems its application would have occasioned. We therefore see no reason to think that § 7602(c) means more than it says.