In an amazing coincidence, Colorado lawmakers ended up with license plates that didn't show up on speed cameras, meaning that they got to get away with thousands of dollars' worth of moving violations without ever paying fines. The DPW won't try to collect on the fines, because that would be hard.
According to CBS Denver, the info for these particular license plates is never entered into the DMV database, so when some state senator goes zooming by a speed camera, he or she won't get a ticket, because the camera system looks up the license plate number through the DMV. Since no info comes up, no ticket is given.
This appears to be true for parking tickets as well. See, even though a parking enforcement officer might leave a ticket on the car, cities like Denver that rely on the DMV for addresses of vehicle owners come up empty when they try to collect on those tickets.
Colorado Lawmakers Have Magical License Plates That Prevent Them From Getting Tickets [Chris Morran/The Consumerist]