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2. Project 25 - Wikipedia

   en.wikipedia.org/wiki/Project_25

   Project 25 (P25) is a suite of standards for interoperable digital two-way radio products developed by public safety professionals in North America and accepted worldwide. P25 radios enable voice and data communication for emergency response, security, and commercial applications, using various modulation protocols and encryption methods.

3. Trunked radio system - Wikipedia

   en.wikipedia.org/wiki/Trunked_radio_system

   Learn how trunked radio systems use a control channel to automatically assign frequency channels to groups of user radios, increasing efficiency and interoperability. Find out the principles, benefits, and applications of trunking in public safety and other sectors.

4. Citizen (app) - Wikipedia

   en.wikipedia.org/wiki/Citizen_(app)

   Citizen is a mobile app that sends users location-based safety alerts in real time, using radio antennas to monitor 911 communications. It also allows users to read updates, broadcast live video, and leave comments. The app has been controversial for its original form of Vigilante, which encouraged mob justice.

5. Automatic number-plate recognition - Wikipedia

   en.wikipedia.org/wiki/Automatic_number-plate...

   Learn about the history, components, and applications of ANPR, a technology that uses optical character recognition on images to read vehicle registration plates. Find out how ANPR is used by police forces, toll collection, and traffic monitoring, and what are the privacy issues and challenges of this technology.

6. Stingray phone tracker - Wikipedia

   en.wikipedia.org/wiki/Stingray_phone_tracker

   A Stingray is a cellular phone surveillance device that mimics a wireless carrier cell tower to intercept communications data or metadata from nearby devices. Learn about its technology, active and passive modes, and legal issues in different countries.

7. Computer-aided dispatch - Wikipedia

   en.wikipedia.org/wiki/Computer-aided_dispatch

   CAD is a method of dispatching emergency services assisted by computer. It is used by police, fire, ambulance and other public safety agencies to handle calls for service, dispatch and track resources in the field.