Casino Gambling, especially in the US, is a very heavily regulated industry. Casinos are most likely owned and operated by some of the bigger or largest shareholder corporations in the world. They would probably not be rash enough to risk their gaming licenses by cheating. One example for an online casino of bigger size is the Sands of the Caribbean.
Besides, casinos are not depending on cheating since most players lose their money by their own fault.

This is for personal gain. They would let an accomplice win and share the winnings after the shift. If you think you are being cheated, move to another table or casino.