"This is a horrible idea."
It certainly is. What if some 'copy cat' decides to pose as one of these unmarked officers, pulls some girl over and attacks her?
a few years back we had one such wannabe floating around. would take out his red light and pull over cars being driven by young women. then he'd rape them. dunno if he ever got caught, but there are a lkot of nuts like that out there,. let's condition our children to pull over for anyone with a red light, shall we?