[ChuckMcM]

Isn't getting back plagiarized answers a good indication though? Did you tell them you wanted it to be their own work?

As I have gotten older one of the things I'm cognizant of is the difference between what I mean and what my kids hear. So "take this problem home and solve it" from me means that they should take it home work on it themselves and bring back their best solution. But they might hear it "take this out of my sight, put the answer on it, and bring it back to me." where in the land of "out of sight" there are really no restrictions on what or how they get it done. As a result I find myself being a bit prescriptive, saying "Take this home and work on it, and bring me your solution tomorrow, we're going to talk about your process of how you got to the answer. When we talk, saying 'I asked on Stack Overflow' isn't going to be a good answer, ok?"

Their response will be informative, from moral outrage that I would suggest they can't do the work, to understanding that the integrity of the process was part of the problem set. All of that helps you understand how they approach being asked to do things.