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Technical Surveillance Threat Levels

The threat posed by technical surveillance devices may be broken into ten basic levels. As each threat level increases the difficulty of detecting the device increases by an order of magnitude (for levels 1-9).

These threats are clustered into three major groupings, with a fourth group for emerging technologies or threats based on misunderstandings of technology or (in some cases) pure fantasy.

Each level correlates to specific types of eavesdropper, and equipment being used. Each level also correlates to a specific type of TSCM inspection, methods, and procedures.


Level 1 - Common Consumer Products and Toys

Level 2 - Amateur and Consumer Communications Products

Level 3 - Amateur Eavesdropping Products


Level 4 - Restricted Professional Products

Level 5 - Professional "Spy Shop" Products

Level 6 - Professional "Title 3" Products


Level 7 - Signals Intelligence Products

Level 8 - Intelligence Agency Eavesdropping Threats

Level 9 - National Security Eavesdropping Threats


Level X - Hypothetical, Misunderstood, or Delusional Threats


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Copyright ©1993, 1994, 1995, 1996, 1997 James M. Atkinson