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Text: 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.