I used to teach a college lab course where students would do a lab project on their own time and then bring it to class to have it checked and graded. I'd alway

I used to teach a college lab course where students would do a lab project on their own time and then bring it to class to have it checked and graded. I'd always ask a few basic questions about it and it was really obvious who didn't do their own project. I would do something similar. Ask a few questions about how they solved it, why they made a certain decision, etc.