[josefresco]

"and can derive no real benefit from it themselves"

I would think that would be pretty impossible to conform to no matter how you structured the intern's day/tasks. Unless you simply provided them a desk in which to study, or worked and let them observe with no interaction I would think sticking to this rule would be difficult.

[hga]

I think that's the idea, to make it impossible for them to be useful and legal.