U.S. v. Kahn, No. 72-1328 (U.S. Supreme Court) (415 U.S. 143; 94 S.Ct. 977) (February 20, 1974) (Justice Stewart)
The Court explained that the purpose of the necessity requirement is to ensure that the relatively intrusive device of wiretapping "is not resorted to in situations where traditional invstigative techniques would suffice to expose the crime." (Id., at 153, n. 12).
Court explained to purpose of the "necessity requirement" of ...
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