Which department is credited with early on-the-air voice communication in 1928?

• A. Detroit PD
• B. Chicago Police Department
• C. New York Police Department
• D. Los Angeles Police Department

Answer: (A)

Two-way radio communication in policing marks a major shift from phone-driven or messenger-based dispatch to real-time, voice contact between the street and the station. In 1928, the Detroit Police Department pioneered on-the-air voice transmissions, making them the first to operate a mobile radio system that allowed officers to hear dispatch and report back while out on patrol. This early use of voice radio dramatically improved response times, coordination, and officer safety, setting the pattern that other large departments would follow in the years that followed. While Chicago, New York, and Los Angeles would later adopt similar systems, Detroit’s 1928 implementation is the earliest documented milestone in this area.