FILE - In this Jan. 15, 2014 file photo, a Los Angeles Police officer wears an on-body camera during a demonstration for media in Los Angeles. The fatal police shooting of the unarmed black teenager in Ferguson, Mo. has prompted calls for more officers to wear so-called "body cameras," simple, lapel-mounted gadgets that record the interactions between the public and law enforcement. (AP Photo/Damian Dovarganes, File)
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