When I was involved in intelligence gathering, the second that it was discerned that communication with a US citizen was involved, the recording had to stop immediately, the "hand scan" (written notation by us, "the operatives") had to be noted, and not transcribed, the watch office had to be notified immediately, a report filed with Ft. Meade, and the tapes, and all hand scan pages, immediately filed, for further review. Failure to do so, by an op, put you in jeopardy of criminal prosecution. ZERO exceptions.