Well, when pulled over, he rightfully responded that there were no RD that he could surrender to the LEO. He then pointed out that his car has a Sirius radio and that there were some service bulletins out about interferences between Sirius and RDDs.

I was given a trick by a car appraiser: if you have an expensive RD in your car, you should always carry an El Cheapo broken RD, a $15 piece from eBay that you can voluntarily surrender if asked...