I think I was in Arizona, maybe Texas but I saw a plain clothed officer and on his hip was a Walther PPX. So I asked him, is that what his department issued. He said no but he was allowed to pick whatever gun he wanted and said his budget was limited but he tested several guns and the PPX won out due to affordability, ergo's, accuracy, he loved the trigger and round capacity. He said he carried HST 147gr as his choice ammo. I thought it interesting as that was the one and only PPX I've ever seen carried by law enforcement. His was a small department as well.