Currently, all police officers generally share the same barking, growling, low-pitched voice, save maybe for a few exceptions taken from the rural voice sound pool. My suggestion is to take the three woman cop skin models (
wfyclpd,
vbfycpd, and
wfycllv), and associate them with voice lines taken from Barbara Schternvart. She fits the role perfectly as she has a lot of policing-related quotes, including demands of "holding it right there", freezing, and "putting the gun down", as well as giving warnings, pulling people over, and a whole range of arrest quotes. She also refers to a fine, which could be a nice addition to the ticketing system.
(NSFW Hot Coffee quotes included)The only problem with her is that there's currently no replacement line for the vehicle loudspeaker voice. That could only potentially be fixed through the use of an audio editor and consequently the sound plugin.