Urban legend at it's best.
Right up there with the deadly toilet spider story on commercial passenger jets.
Cops, (REAL cops) do not do that. Even if an off-duty officer does assist in a traffic stop, he always has identification and presents it before doing anything like that. I bet many of them would tell you that would be a sure fire way to get killed or injured if they ever did a traffic stop in that manner.
I too call BS to the 10th power.

