[jrm4]

Yup. I sort of independently discovered this mechanism, and not just for "cheating," but for group work. Didn't even have to go individual interviews.

It was simple, I let students work in groups to do coding stuff (it's an intro type of class with students of varying skill levels). I had them work on a project together all they wanted, letting them know that it would be turned in about a month or so before the end of the semester. I would review them and then, in class, they would INDIVIDUALLY be quizzed on their own teams project; down to e.g.

"You have a function blahblah, explain what it does. What would happen if I passed it X?"

Forces them to work together and sort of study together. Kind of puts a bit more pressure on the less knowledgable, but probably worth it.