What is the best device to record the TSA when traveling? Would it be an Ipod touch, a regular ipod, perhaps two devices (in case they take 1?)

Background: 3 years ago I was given a $80 seat belt ticket after I had gotten out of my car. I had my seat belt on while driving, but how can you prove it after you are out of your car. When I asked the NYPD police officer his name, he asked if I wanted another ticket. I reported it to community board who could care less since we were the same race. Internal affairs called me a month later on NYe at 11:30pm and 6am to try to get rid of the case. Now I believe for my protection it's best to record these police/tsa encounters. If I had a video of the above encounter, this rogue cop would of been fired.