i've always seen the perk get carted off by a second car when the cameraman is in tow. unless all the other cars were busy responding to werewolf sightings.
Looks like they're in a civilian car, possibly the perp's. It's standard for one cop to sit in back to keep control of her while the other one drives - if she were in back she'd be at the garroting/knifing/whatever advantage.
Also great: All of the "related videos" on youtube are of women getting arrested or flipping out in exciting ways, except, inexplicably, for one Hall and Oates video that is not "Maneater."