Trussville AL is HK USA importer.
Trussville same same Chantilly same same Sterling (from a business stand point).
The police trade-ins are being imported by HK through their Trussville establishment.
Show a close-up pic of the right side of the slide & I can tell you if indeed it is a police trade-in.
BTW all current police-trade-ins are from lower saxony w/ Stamp Nds surrounded by an oval circle