While writing my intro physics exam, I looked at the person next to me, he had his hand stretched across the length of his desk and threw a piece of paper on the ground as soon as I looked at him. He appeared startled. note: we were sitting in the last seat in the corner rows of the gymnasium away from the TA's/Profs. note: The paper in question is still on the floor angled 45 degrees from the upper right corner of his desk. I raised my hand, and reported my suspicion to the TA. He went to consult the head prof. When he left, the student looked at me and said "I wasn't cheating, it was a Life Saver, blah blah blah". I just shrugged. I don't know why he felt the need to explain to me what he was doing. When the prof came and asked him about it he said "I can explain, it was a lifesaver". The prof. said "well don't let it happen again". Does this not sound like an admission that he and his friend were passing something amongst themselves? Furthermore, if he wasn't cheating, then why didn't he pick up the paper and present it to the prof? note: the paper in question is still in the position I described earlier. Towards the end of the exam the TA did come and pick up the paper. Did I do the right thing, or should I have kept my mouth shut?