Chesapeake Strategies Group - A Leading Security & Strategic Intelligence Firm CSG utilizes a systems approach to support the technical security needs of clients. We have extensive experience in developing and implementing technical security programs utilizing CCTV, biometric access control and other advanced technologies. CSG works closely with management to design security systems that create a comfortable, yet secure, working environment within the organization’s culture. CSG technicians have extensive backgrounds in conducting Technical Surveillance Countermeasures (TSCM) sweeps. A TSCM sweep provides a technical evaluation of the relative security for oral and telephonic communications, and identifies any actual listening devices and/or hazards.