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Using 50 USC 1802 would require the Attorney General to certify certain things in writing, under oath. If this is how the wiretapping was authorized then there is a definite paper trail.
Lynch may be in deep chit due to “B” which clearly states that “there is no substantial likelihood that the surveillance will acquire the contents of any communication to which a United States person is a party; and......
I think it was authorized via FISA.