Body Cameras Were Sold as a Tool of Police Reform. Ten Years Later, Most of the Footage Is Kept From Public View.

At least 1,201 people were killed in 2022 by law enforcement officers, about 100 deaths a month, according to Mapping Police Violence, a nonprofit research group that tracks police killings. ProPublica examined the 101 deaths that occurred in June 2022, a time frame chosen because enough time had elapsed that investigations...