All I know about Duke is what went down with Kris Humphries and while it wasn't anything major, there was more to that story than was given to the public.
Why was Kris allowed to play for Minnesota as a freshman and get out of his LOI, well because they we're going to expose some of the things that went on in there short relationship at Duke and the NCAA wanted no part of that. I haven't heard too much about Duke other than what a complete a-hole Coach K really is when the cameras are off.
It's no secret that the SEC is usually at the top of list, Mississippi St. being the worst.
It's an interesting topic and a dangerous one since most of this is unprovable and relies heavy on rumors and heresay. We're far from angels, as I'm sure fans of those schools would point out, but we're also one of the few college towns where the media would go after the local teams like they did in 99. I'm sure the local media at most of these schools hears plenty of rumors of cheating but they have such a love affair and close relationship with the school that they ignore them, here it turned into a feeding frenzy.