The following excerpt is from U.S. v. Hulberg, 953 F.2d 1389 (9th Cir. 1992):
We therefore look only to United States law; it is settled--and defendants do not contest this point--that recordings to which one party consents do not require a warrant. United States v. Keen, 508 F.2d 986, 989 (9th Cir.1974).
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