How do you pull someone over and they are legally parked? Doesn’t make sense to this cop, but ok. Lock ‘em up if they broke the law.
Say I roll through a stop sign in a residential area. A cop lights me up and I pull over next to the curb in front of a house (where anybody can park at any time). After checking me out, he realizes that I have a warrant and takes me in. The car is legally parked...no reason to tow.