Technical Surveillance Countermeasures (TSCM) a.k.a. electronic bug detection sweeps is the best way to anticipate active or passive eavesdropping attempts by 3rd parties, (i.e., GPS trackers, hidden cameras, hidden recorders, etc.)
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Our equipment is state of the art and we can detect ranges on the electromagnetic spectrum from 1 megahertz to 10.5 gigahertz (military grade detection.)