in my dad's fraternity they'd do the same thing
set up some lights, get a chair, strap the kid down and interrogate them. shit got intense because of the hostile feel of the questioning. they didn't even ask super specific questions, but they made the kid getting questioned feel like they knew he had done something and then he'd just admit to it and they'd laugh their asses off. one kid admitted to banging his sister after like 5 minutes of crying....