I handed back a lot of papers Friday and I belive, but cannot prove, that one student, who had not turned in two assignments, erased the name of a friend who sits near him from that kid's two returned papers and showed them to me as if they were his (the original kid) and I had not recorded them. I am certain I did not NOT record two of this young man's papers but I can't find any obvious evidence of tampering. I do think he did tamper with his friend's papers though. These two papers are worth a minimum of points but the seed has been planted in my mind that some students will find any way they can to get more points. The real consequence is that a graded test, which I had planned to return to them tomorrow and allow them to keep as a study guide for an upcoming nine-weeks test, I am now not willing to allow them to keep. Many teachers in my building pass back tests and then re-collect them and file them away, ostensibly in case parents come in looking for "proof" of their child's grade. For me, I am now afraid that a student will try to change an answer on his or her graded test and then claim I didn't score it right. This is so aggravating and annoying. What are some of your policies with regard to the disposition of graded tests, and what are some of the experiences you have had with kids manipulating or changing information, lying about it, to get a higher score?