Heh, I'm a judge....who'da thought most of my ideas would revolve around what I play eh? Seriously though *chuckles* I think the Cruisers and Explorers couls use loudspeakers on the outside, like police officers of the current times. Make it similar to the observation room's operation.
ex:
to radio Step out of the vehicle with your hands up!
From the cruiser a voice booms, "Step out of the vehicle with your hands up!"