It seems to be an old already published in a book…
WaPo ‘Bullygate’ Profile Foreshadowed Mitt Romney ‘Police Impersonator’ Story

But in a well-known prank in which Romney flashed a police siren and, bearing a fake badge and cap, approached two friends and their dates parked on a dark country road, there was a stronger undercurrent of fear to the incident than commonly conveyed. Candy Porter, a Kingswood boarder from a small town in Ohio, had a strict 11 p.m. curfew. As Romney and his Cranbrook pals played out the joke, pretending to be shocked over empty bourbon bottles in the trunk, Porter thought of the dorm mothers waiting at the door and the threat of expulsion. “I just remember being like a deer in headlights,” she said. “I just remember being terrified.” Once she realized it was all a prank, and was safely back at her dorm, Porter joined in the laughter.

He wasn’t wandering around pulling over drivers. The “uniform” was a hat and a badge. Labeling this as some sort of perverse fetish for uniforms is just silly. Nontroversy.