Not a law enforcement loadout but this is my circa 1880ish outlaw loadout, which might still provide you some inspiration.
It's largely period authentic apart from the primary. You can't really tell in the pic but I'm holding a GE M870 which will have to do until I get a KTW Winchester. In my right hand is a Tanaka SAA. I also have a Umarex Colt not pictured
I do have a Deputy Marshall one too but no decent pics at the moment. We're playing a Wild West game on Saturday so hope to get some then!
Pic credit to The Airsoft Project.
edit: just reread and realised you're looking for inspiration for more recent law enforcement.. sorry!