The following excerpt is from United States v. Kirk Tang Yuk, 885 F.3d 57 (2nd Cir. 2018):
have been tried and have failed or reasonably appear to be unlikely to succeed if tried or to be too dangerous." Id. This last requirement (the "necessity" requirement) does not, however, reserve wiretaps as a last resort for law enforcement. Concepcion , 579 F.3d at 218. It requires only that agents "inform the authorizing judicial officer of the nature and progress of the investigation and of the difficulties inherent in the use of normal law enforcement methods." Id. (quoting United States v. Diaz , 176 F.3d 52, 111 (2d Cir. 1999) ).
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