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The Cheverly Police Department purchased eight cameras last month, officials said.

“Using such technologies could become a practice in large or small agencies, especially state police agencies who have lots of interaction with motorists,” said Cynthia Lum, director of the Center for Evidence-Based Crime Policy at George Mason University.

But she pointed out that objections from unions or citizens, as well as the simple cost of outfitting large departments, might preclude the technology from being adopted more widely.

“Larger agencies could have less resources to spend on this type of technology and may be more focused on core technologies such as improving information technologies and records management or upgrading radio or in-car computing technology,” Ms. Lum said.

Supervisors regularly review footage from officers’ cameras, giving them an opportunity to see where officers could benefit from additional training as well, Chief Rice said.

Additionally, the recording of officers’ interactions headed off at least one police complaint.

“We had one person make a claim and we explained to them that we would check the video on the officer’s interaction. When they heard we had video, they changed their mind and they didn’t want to complain,” Chief Rice said.