Which Police Department was the first to use an "on the air" voice communication system in 1928?

The first police department to implement an "on the air" voice communication system in 1928 was indeed the Detroit Police Department. This notable advancement in communication technology allowed officers to communicate in real-time over radio, significantly enhancing their ability to respond to incidents and coordinate with one another in the field. The adoption of this technology marked a pivotal moment in law enforcement, as it allowed for quicker response times and improved situational awareness.

The success of Detroit's implementation likely served as a model for other departments, contributing to the eventual widespread use of radio communication in police work across the United States. This historic decision reflects the commitment to modernization and efficiency within the department, setting a standard for police communications that many other cities would follow.