The policemen would know when they where using the cameras or not and could react accordingly, the people being arrested or having any interaction with the police wouldn't, so they behaved properly in both occasions and/or didn't make false claims about mistreatment by the police.
The policemen would know when they where using the cameras or not and could react accordingly, the people being arrested or having any interaction with the police wouldn't, so they behaved properly in both occasions and/or didn't make false claims about mistreatment by the police.