At BUR this morning, as I was going through TSA security, they had a gentleman pulled aside and were giving him the wonderful two-handed rub down. He looked a little annoyed, but cooperating nonetheless. After his free groping by TSA, he walked over to the GA and was moved to the front of the line and then off to the side. He was boarded first without being in F or an Elite member of the airline and seated in 7D - with a clear view of F and the cockpit entrance. Obviously, this gentleman was an Air Marshall. Why on Earth would the TSA be patting down an Air Marshall?