[Small Fry]

I assume that these marks can be seen somehow. Like from a glare of light or something. If not what good do they do? Would the player need to feel them? Who does this benefit? Only person that comes to my mind is the dealer. Any player have especially nice sharp fingernails?

I would be inclined to pull decks at random intervals during the games and inspect them. Should take no time at all to find the aces and check them. Seperate the likely suspects as much as possible too. Heck, I would even go so far as to sit out a tourney and just monitor everything.

While I'm not all for beating somebody in this situation as it can lead to some serious legal trouble I am for publicly outing this person. Since I'm located close to you I don't want this guy migrating to my game.

Good luck and keep us posted.