The only way you could know this to be true would be if someone had successfully demonstrated magical powers in front of of Randi under conditions that prohibited cheating, followed by Randi's refusal to pay up.
Do you know of such an occurance? If so, please document it.
Randi has structured the rules of his “challenge” in such a way that it would be functionally impossible to overcome it, and also functionally impossible to sue him if you did, and he reneged. No one in his right mind would sign the legal contract for such a challenge.
You can read about it here...
http://voices.yahoo.com/exposing-unfair-truth-james-randi-1000000-120038.html
OOps...wrong link..it’s this one...
http://dailygrail.com/features/the-myth-of-james-randis-million-dollar-challenge