I had to take my bike in for service. While there, I noticed several other law agencies bikes in the pick-up or drop-off lot.
Wandering around them I was surprised to see only one out of five law enforcement agencies had a radar unit (Stalker Dual 37.4) and it was a sheriff's bike and not a police bike. It did have a paper calibration sticker on the top of it with a website like radarservice.com (cannot recall the exact name, but it was long). The interesting part of this is that name is not one of the Stalker Authorized repair centers in California on the Stalker website which is like RHF company or something similar. The date in ink was so faded it was illegible.
This is southern California around the Thousand Oaks area and Ventura, west of LA.
Seems odd, but it looks like more and more are resorting back to the old PACE methods on patrol bikes and not using (or paying for) radar units. BMW has, by necessity, installed accurate speedometers in their patrol bikes. The mechanic said, for a while, they couldn't write tickets unless the new and more accurate speedo head was installed.