I'm new to golf and my friend plays provisional balls all the time. He told me that he doesn't know where his first ball went so plays a second one off the tee. Then we go to his second ball, he doesn't even look for the first one. Then after he shoots his provisonal ball he usually finds his first ball and plays it. Is he allowed to do this? What is the rule with provisional balls? What is to stop someone from taking one on every hole? Isn't he supposed to take a drop where the ball went out of bounds?