My wife works in dentistry and occasionally will fill in on certain days at other offices for extra cash. Problem is, some dentists will stiff you because they know they can. They all talk to each other in the area, and if you go after them for stiffing you, you won't work in the area again. Not much recourse in this lovely state, unfortunately. You just have to learn who the assholes are and avoid them. Sometimes, you learn the hard way.