◆ SpookStack

“ PROBLEM OF MICROPHONES INVOLVING TRESPASS Review of Bureau Policy by Executive Conference, June 9, 1950 The unsettled law regarding the admissibility of evidence obtained from microphones was obviously of ~ continuing concern to Bureau officials. That concern and & realistic effort to deal with this situation are reflected in the deliberations of the Executive Conference held on June 9, 1950. (Exhibit 19 The Conference dealt with the t | } problems inherent in the use of three types of microphone ae: :-:. in addition to monitoring conversations in a room, overhears both sides of any conversation on the telephone; (2) a microphone installed in the space either occupied by the subject or in which the subject is located at the time the conversation occurs; and (3) a microphone located outside the space occupied by a subject, such as a contact microphone on an adjoining wall which does not involve trespass. The Executive Conference reviewed existing policy on these types of installations and noted that in none of the three installations cited did the Bureau advise the = 12 « - . wm twee