I can't remember if it was this group or CLASP that recently had a discussion about how student researchers are paid. I have been looking at this more deeply lately because our UR and HR offices wanted to go to all internship stipend payments. However, as I dig deeper, it doesn't seem this is allowable unless the grant is a training grant or training is defined in the Scope of Work and is approved by the Agency. So any other grant, student researchers must be paid as employees.