What is the possibility that I can be cheated in major poker tournaments?

Actually, there is no possibility to be cheated in major land based tournaments, because of casino security policy. Also dealers change all the time to avoid any chance to deal certain cards to certain player.

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Andy Bloch
RT @Poker2Nite: Filming episode #2 tomorrow. We'll be joined in studio by guest @Andy_Bloch he better give up his blackjack secrets...
4 minutes ago
Matt Savage
RT @allenkessler: @pokerati would be nice to add # advancing from day 1. Thinking about canceling all day 1's so the whole field advances!
9 minutes ago
Layne Flack
It was very surreal, and a great time oh and security never came back after that. Hmm. Oh well
19 minutes ago
Layne Flack
And gladiators main man WOLF were playing doormen. The party lasted until about 5:30 am and our jet left at 11 am.
20 minutes ago
Layne Flack
Was singing for us. Now security never came back a 3rd time. I believe it was because I had WWE superstar sgt slaughter
21 minutes ago