Oh man, marking cards...HAH!

I know of another story from a long, long time ago in Minnesota at an Indian reservation casino (early 90's). If I remember correctly some guys beat a 2-deck handheld (cards dealt down) blackjack game at Jackpot Junction casino and took the place for $25-30,000. It turned out these guys were wearing special sunglasses where they would "daub" the cards with some sort of flourescent paint that only the special sunglasses could see. The naked eye couldn't tell the difference. I don't remember any details beyond this.