A friend of mine is applying for a job as a NYS trooper. The application process involves a background investigation and a polygraph exam. During the interview process, my friend informed the investigators that he had purchased $20 of marijuana from me a few years ago. I received a phone call from one of the investigators. In his message, he said that he has a few questions for me and that it's about my friend not about me. My friend says that they just want to verify the story he told them (that he only bought $20 worth, that it only happened one time, etc.) and that they don't care about a petty sale that occurred years ago. My question is this: are the police trying to set me up to get a taped confession or are they really just trying to verify my friend's account?