What to do if you suspect a player is cheating?

[allyasia]

ya, there are soo many on fulltilt as well

[mikeca]

I play live low limits and I see players like this all the time. Many times they lose, but every once in a while they get hot and win big time. These are the fish. You have to feed the fish to keep them coming back. If they lost every time, they would give up poker.