NEW YORK, NY - DECEMBER 03:  New York Police Department (NYPD) Sergeant Joseph Freer demonstrates how to use and operate a body camera during a media press conference on December 3, 2014 in New York City. The NYPD is beginning a trial exploring the use of body cameras; starting Friday NYPD officers in three different precincts will begin wearing body cameras during their patrols.  (Photo by Andrew Burton/Getty Images)