To take that issue a bit further, I've wondered about the person who happens to know that you frequently carry and then they get mad at you and want to dick you over so they just yell gun even when they don't see anything, yet claim that they did. How could you ever prove that it didn't "print"??? What are the legal ramifications of that situation?
There will be none. you will just be told to do a better job of concealing it. If it is obvious that you are concealing to the officer, then they will just ask you to be more careful. It is not like you are brandishing.