Hello all, I am a high school chemistry teacher and I have a very interesting situation. I always write out my key before the test (especially topics like stoichiometry, or anything calculation based) because I catch major test errors that way (which can creep into any test). I always start to grade tests once all the students are done. A few days ago during my second of three classes the key disappeared from my desk during passing period. I found the key stuffed under a chair later in the period. Upon grading the tests the first period is clean, no cheating. Period two I have 5 tests that are way to close to the key to be legit (and all papers were scored 95+ out of 100. One paper was exactly like the key, the other four were exactly the same with a few missed points). We are talking word by word from the key including pronunciation. In my third class I have 11 out of 36 papers that are 75 - 80% exactly like they key, some exactly a copy of the key. A few tried to be sneaky and leave off half of the answer, some did not get the answer completely, some copied but did not get all the words so the answers do not make since. I have already made 10 parent phone calls and I am making all these students retake an alternate form of the test. Here is the question: when the students take the new test and do as I predict (not perfect) do I give them a zero, or give them the new score? The interesting thing is that the students were all in the same area (4 person tables), while there was no cheating in the one person desks. Likewise this is the hardest test so far this year, the average no cheat test was 72%, the average cheat test was 98%... What you would do?