Many cops (and in big cities maybe none) are not "into" guns. The sidearm is just a tool... to be neglected and abused. Ever seen a police car? They don't baby them, either.
I have a couple former police S&Ws.
Utah Highway Patrol (factory inscribed).
A German PD (roughly stamped).
One was carried by a Los Angeles cop and the other by an officer in NYC.
Went to a police supply shop in Texas but unstamped so no idea who used it.
Purchased as surplus from the Carbon Co. Utah S.O. They carried 4" M19s so no idea how this wound up in their inventory.
Dealer sold a lot of 58s that were said to be police trade-ins but no info on who or where.
Stamped for the Corpus Christie PD.
Shipped to the Campus PD, Univ. of Louisiana.
Federal agent's gun.
A pre-war Heavy Duty used by the Ft. Smith, AR PD.