In terms of seeing someone do something illegal, call the cops, they want your help and will gladly meet the guys at the take out and bust em, espicially if they are keeping more than their fair share of fish. There isn't any secret spots on a drift boat. In terms of people low holeing, there are one of three options, stay there and shut up, stay there and catch a fish and brag about it (espicially effective if the person who low holed you is a guide) or pull anchor and go like crazy and beat the jerk at his own game. Some guides seem to think that first water is a must, but there is nothing like wating behind someone, and then dropping into their hole and catching a fish right behind them. Also don't be afraid to call a guide on low holeing you. A guide would have to be pretty stupid to say much in front of customers espicially when it's obvious that he's in the wrong.