Well obviously an officer would need to use discretion in giving information out. If he's got ANYONE in his (and I'm just using a general his, not dissing the female officers out there) vehicle, especially handcuffed in the backseat, there is NO reason to give any personal information via phone! And that would make absolutely NO difference whether the officer was using a blue tooth or simply holding his phone by his ear, if someone is in the backseat they can still hear the officer speaking on his phone. If the patrol car is in motion people outside the vehicle can't hear the officer's conversation, unless his windows are down and he's screaming so I don't feel your "argument" (I know you aren't really arguing, just pointing out your opinions, that's why I put argument in quotes) is very valid. As for having to program your phone every time to the blue tooth in the car, again, not a valid point. I have a blue tooth unit that's programmed to my phone, I can take it into ANY car I drive and I do not have to program it again. I agree that the PP's suggestion of using the car's speakers would make it necessary to program the blue tooth/phone but if you have a seperate ear piece that you keep with you then there is no need to reprogram anything. And to suggest that the small blue light on the ear piece could cause problems to the officers, I think that's ridiculous, that small blue light can be in anyone's ear, in anyone's car so again, that invalidates that reason not to use them. and yes, officers here (and other emergency personell) are exempt but I do not agree with that at all. As I said earlier, the officer heading to a call is driving much faster then I am, I'm not allowed to use my phone without blue tooth but he is? IMO his situation is much more dangerous then mine is.
I would imagine that dispatch can send a message thru the car speakers or thru the computers that all police vehicles have. I would also imagine that if an officer was on the phone and the call was going thru the speakers that any dispatch call would take precedence and the officer's phone call would cut out. But I don't know, I'm not a police officer or dispatcher so I really have no idea.