Client Countermeasures Checklist

RF and RF sub-carrier sweep to locate room and telephone transmitters. This
involves placing a noise source in the room to trigger any voice activated
transmitters and scanning the RF band for the presence of a transmitter
broadcasting the noise source.

AC carrier sweep to locate room transmitters. As above, except a carrier
current demodulator is used to scan the AC wiring for the presence of a
transmitter using the AC wiring to carry the audio from the room.

Test the telephone line for the presence of room audio when on-hook. This
will identify any microphones, hidden in the telephone or room, that are
attached to the line.

Test the telephone line for the presence of modulated (sub-carrier) room
audio when on-hook. As above.

Physical inspection of the telephone line for the presence of a hard-wired
tap. Sensitive facsimile and dial access computer modem lines should be
included. This involves the physical inspection of riser and main telephone

Physical inspection of the room for the presence of a hard-wired
microphone or remote controlled transmitter. This involves opening and
examining all accessible AC electrical, telephone and intercom outlets, as
well as the space above the ceiling tiles. Once inspected, the outlets are
marked with an ink visible under ultra-violet light. Subsequent inspection
will detect tampering and eliminate unnecessary physical inspections.

Advanced TSCM Signals Detection and Analysis
TSCM - Sweeping the Spectrum for Eavesdropping Devices

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