I wonder how far back they will go. I'm fairly certain CSP and GMAC did it clean. Fred probably did also, with only bringing in like 4 freshmen. Any other coach has me a bit worried.
I would agree that Fred's successful high school recruits -- a bunch of guys that had no business in P5 programs, Naz Mitrou-Long deciding to prove everybody wrong, and then a few high 3* and low 4* players (Niang, Morris, Thomas, etc.) that Fred forged into weapons of mass destruction through their character and his coaching -- were probably out of range of what the AAU handlers wanted and surrounded. Fred was an incredible Xs and Os coach; there is a reason he made it to the NBA, even if the Bulls stink. He made modest pieces into incredible weapons.
I wonder how "clean" was transfer recruiting, on the other hand. Do we think that Royce White and BDJ came here with no strings attached to them? They clearly had NBA talent and came out of programs/circuits with some shadiness behind them. Had handlers already given up on them as washouts by that point, leaving us to have a clean slate? Was there nothing behind the scenes with guys like Maurice Jones or DeAndre Kane or anybody else? I do not know, but that is where I suspect the trouble would be (if it is there with the ISU program of late).
Prohm seems like the most on-the-level guy in the business, but we really have no real evidence of knowing that. I hope Wigginton's recruitment was squeaky clean.