The National Institute of Justice (NIJ) Sensor, Surveillance, and Biometric Technologies (SSBT) Center of Excellence (CoE) has undertaken a best practices report of through-the-wall sensor (TTWS) devices for operation by law enforcement and first responder agencies in the United States. These devices use a form of radar to detect movement behind barriers. The ability to sense the presence of individuals through common building materials can be useful during rescue operations, law enforcement operations and other tactical scenarios. This report provides advice, tactics and information related to the use of TTWS in operational settings. The information provides law enforcement individuals and organizations with a better understanding of the capabilities and limitations of available TTWS equipment. When put into practice, an agency can make the most of the technology and improve the outcome and safety of operational scenarios in which it is deployed. The best practices report focuses on the use of commercially available TTWS devices suitable for law enforcement or emergency response applications.

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