Already mentioned but a buddy of mine was in a bass tournament in MN and a guy got busted for catchingfish the day before and tying them to heavy mono line for retrieval the next day during the tournament.

Personally, I've seen cards that were marked (like a slight nickfrom afingernail or a faint crease in thechosen card)during a night of Texas Hold'em for paychecks. Considering that guys were playing for paychecks, it was a miracle that nobody got killed.