I went to a measurement handicap workshop about ten years ago when IRC was first being introduced in the US. There were staff experts who here from both US Sailing's Offshore Office as well as RORC. This was when Jim Teeters was there and aslo a guy named Andrew ------, can't remember his last name.
Basically it was explained to me that with the machine the US Sailing owns and operates that can measure hull stations to within a tolerance of a sheet of copy paper there was cheating going on in many one design classes. Examples that I was given pointed to both the Melges 24 and Farr 40 classes. These hulls are not supposed to be touched other than polishing...but since adding very thin layers of gellcoat is impossible to detect this was being done. At 40K to do a M24 it was out of the reach of many in the class but the guys with the super deep pockets. They were essentially making the hull perfectly faired and also symmetrical port and starboard.