The CHL is not relevant. He is either a danger to himself and others or he isn't. If he is, then you should take the same action you would if he didn't have a CHL. If you believe he is in fact a danger to himself or others, notify the proper authorities. If after they investigate they feel there is a need for an evaluation then the rest will take care of itself.
Simply put, if your focus is on the CHL, then you are focusing on the wrong thing. The CHL is not the issue and having it taken away does not resolve anything.