Ref: Audio Surveillance Countermeasures for SCIF DCID 1-21 or DIAM 50-3; Secure Conferencing Requirements.

Most important decisions are discussed before they are finalized in writing. Audio surveillance of these "private" conversations can give unauthorized listeners the information they desire and the lead-time necessary to make use of that information. There is currently an unprecedented assault on audio security using more than just "bugs". Most executives are completely unaware of how vulnerable their organization is to audio surveillance.

When Government Organizations have a requirement for the confidentiality of classified materials or a SCIF, they are usually required to comply with DIAM 50-3 or DCID 1-21.

Chapter 12 on "Acoustical Control and Sound Masking Techniques" requires that certain measures be taken to protect the secrecy of conversations. Most often compliance is achieved by acoustical treatment of:

Doors, Windows, HVAC, Ducts, Ceiling Plenums, Walls, Conduit & Pipes

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