Technical Surveillance Countermeasures is not paranoia, it is due diligence for sensitive meetings.
When a board discusses acquisitions, restructures or litigation strategy, the room itself becomes an asset worth protecting. TSCM, Technical Surveillance Countermeasures, is the disciplined, evidence-led practice of ensuring that no unauthorised device, transmitter or exploit is monitoring that conversation.
A robust sweep combines RF spectrum analysis, thermal inspection, non-linear junction detection, and a full physical inspection of furniture, fixtures and telecoms. Done well, it is quiet, forensic, and entirely discreet, the exact inverse of the "spy movie" cliché.