For freshman year math courses, we wrote two versions of each test. They'd be nearly identical, but with a few of the numbers and variable names modified. We'

For freshman year math courses, we wrote two versions of each test. They'd be nearly identical, but with a few of the numbers and variable names modified. We'd alternate passing them out so that people sitting next to each other had different tests. We'd also go around the room and write down who was sitting where. This made it really easy to catch the "look at your neighbor's paper" sort of cheating. (It's really hard to text answers to a calculus test, and taking a photo of your page would be really conspicuous.) Other departments had their own anti-cheating methods. Kids coming straight out of high school, who were used to less sophisticated cheat-detection methods, tended to get burned pretty bad their first semester.