The below statement seems to be the appropriate way to do things:
Any participant found, at any time, to be using a fraudulent handicap will be expelled from the tournament and all fees will be forfeited.
In addition, players who score exceptionally low scores will have their handicap reviewed and adjusted if necessary on a daily basis. Any player who scores exceptionally low scores after being adjusted may be disqualified. Any players disqualified will forfeit all paid tournament fees. All decisions of the Tournament Committee are final.
The player should have been able to play the final day then reviewed and then disqualified at that point if necessary.
I myself have shot a 102 then turned around and shot a an 85. (It happens)