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(Updated at 10:35 a.m.) A public-records request sheds light on how the Arlington County Police Department justified a change to what the public can hear via police radio channels.

The Freedom of Information Act inquiry by ARLnow uncovered documents about the department’s March change to encrypt more radio chatter. The documents cited safety and security concerns, including some related to last summer’s police reform protests and the Jan. 6 breach of the U.S. Capitol.

Whereas the public — including news outlets like ARLnow and local TV stations — used to be able to hear more details about a police incident in progress in Arlington, now in most circumstances only the initial dispatch and basic information from the scene can be heard…