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Text: The only conceivable foundation for the Ninth Circuit's rule that an IRS summons issued at the request of Canadian authorities may not be enforced unless the IRS provides assurance that the Canadian investigation has not proceeded to a stage analogous to a Justice Department referral is therefore the language of the 1942 Convention itself. Article XIX obliges the competent authority for the United States to furnish, upon request, relevant information that it is "in a position to obtain under its revenue laws." Article XXI repeats this clause almost verbatim, permitting the IRS Commissioner to supply Canadian authorities with relevant information he "is entitled to obtain under the revenue laws of the United States of America." Respondents contend that because the IRS would not be able, under American law, to issue an administrative summons to gather information for use by the Government once a Justice Department referral was in effect, the IRS is not in a position to obtain such information once Canadian authorities have reached a corresponding stage in their investigation.

We are not persuaded by this argument. "The clear import of treaty language controls unless `application of the words of the treaty according to their obvious meaning effects a result inconsistent with the intent or expectations of its signatories.' " Sumitomo Shoji America, Inc. v. Avagliano, 457 U.S. 176, 180 (1982), quoting Maximov v. United States, 373 U.S. 49, 54 (1963). Articles XIX and XXI both refer to information that the IRS may obtain under American law. American law, however, does not contain the restriction respondents claim to find there. Section 7602(c) only limits the issuance of summonses when a Justice Department referral is in effect; it says nothing about decisions by foreign tax officials to investigate possible violations of their countries' tax laws with a view to criminal prosecution outside the United States. The elements of good faith we outlined in United States v. Powell, 379 U.S. 48 (1964), do not contain such a restriction. Nor does our reasoning in United States v. LaSalle National Bank, 437 U.S. 298 (1978), favor the result respondents urge, because the provision of information to Canadian authorities could not curtail the rights of potential criminal defendants in this country by undermining American discovery rules or diminishing the role of the grand jury. And respondents have not suggested that some other segment of American law, such as the law of privilege, prevents the IRS from issuing an administrative summons pursuant to a treaty request once a treaty partner has embarked on a tax investigation leading to a foreign criminal prosecution. Articles XIX and XXI of the 1942 Convention on their face therefore lend no support to respondents' position.

Nontextual sources that often assist us in "giving effect to the intent of the Treaty parties," Sumitomo, supra, at 185, such as a treaty's ratification history and its subsequent operation, further fail to sustain respondents' claim. The Senate Committee on Foreign Relations did not hold hearings on the Convention prior to its ratification in 1942, and the Committee Report did not even mention the provisions for exchange of information. See S. Exec. Rep. No. 3, 77th Cong., 2d Sess. (1942), 1 Legislative History of United States Tax Conventions (Committee Print compiled by the Staff of the Joint Committee on Internal Revenue Taxation) 455 (1962) (Leg. Hist.). The sole reference to these provisions during the brief floor debate in the Senate contained no hint that the 1942 Convention was intended to incorporate domestic restrictions on the issuance of summonses by the IRS in connection with American tax investigations, such as the limitation later codified in § 7602(c).[7] The President's message accompanying transmittal of the proposed treaty to the Senate, see S. Exec. Doc. B, 77th Cong., 2d Sess. (1942), reprinted in Leg. Hist. 445, and the President's Proclamation at the time the Convention was signed, see Leg. Hist. 475, 56 Stat. 1399, similarly contain no language supporting respondents' argument. Indeed, given that a treaty should generally be "construe[d] . . . liberally to give effect to the purpose which animates it" and that "[e]ven where a provision of a treaty fairly admits of two constructions, one restricting, the other enlarging, rights which may be claimed under it, the more liberal interpretation is to be preferred," Bacardi Corp. of America v. Domenech, 311 U.S. 150, 163 (1940) (citations omitted), the evident purpose behind Articles XIX and XXI _x0097_ the reduction of tax evasion by allowing signatories to demand information from each other _x0097_ counsels against interpreting those provisions to limit inquiry in the manner respondents desire. In any event, nothing in the history of the Convention's ratification buttresses respondents' claim.[8]

Nor do other aids to interpretation strengthen their case. The practice of treaty signatories counts as evidence of the treaty's proper interpretation, since their conduct generally evinces their understanding of the agreement they signed. See Trans World Airlines, Inc. v. Franklin Mint Corp., 466 U.S. 243, 259 (1984); Factor v. Laubenheimer, 290 U.S. 276, 294-295 (1933). The Government's regular compliance with requests for information by Canadian authorities without inquiring whether they intend to use the information for criminal prosecution therefore weighs in favor of its reading of Articles XIX and XXI. Similarly, "[a]lthough not conclusive, the meaning attributed to treaty provisions by the Government agencies charged with their negotiation and enforcement is entitled to great weight." Sumitomo, 457 U. S., at 184-185. See also Kolovrat v. Oregon, 366 U.S. 187, 194 (1961). The IRS' construction of the 1942 Convention repudiates rather than confirms the interpretation respondents ask us to adopt. Finally, the result urged by respondents would contravene Congress' main reason for laying down an easily administrable test in § 7602(c): "[S]ummons enforcement proceedings should be summary in nature and discovery should be limited." S. Rep. No. 97-494, Vol. 1, p. 285 (1982). If respondents had their way, disputes would inevitably arise over whether a Canadian tax investigation had progressed to a point analogous to a Justice Department referral when Revenue Canada made its request for information, thereby "spawn[ing] protracted litigation without any meaningful results for the taxpayer." Ibid. It seems unlikely that Congress would have welcomed this result when it ratified the 1942 Convention, or that Congress intended it when it approved the bill containing what is presently § 7602(c).