What Happened When My High School Students Cheated

I have been teaching for 17 years, and thus have seen my fair share of cheating. Most of it is obvious; Students believe they have perfected the stretching neck crane (a new yoga move perhaps?) to see the paper of a peer. They have cheat sheets that (with great subtlety) they place underneath the quiz I have handed out. They write tiny notes on their hands or arms, or surreptitiously slide their phones out of their pockets to look at notes they have typed to themselves, or texts from friends...