If you want to know if someone is a true libertarian–as opposed to a religious demagogue in disguise–ask them what their positions are on drug, gambling, prostitution, and alternative marriage.
In short, if they’re against these things on moral grounds, and, importantly, want them to be illegal–they are outright fakes. The giveaway isn’t that they believe these things are moral issues and have opinions on the matter; it’s whether or not they want the government involved in their legality and/or regulation.
If they do, it means they’re pro-government for the specific things that they personally believe are wrong (as explained to them by the creator of the universe). This is not libertarianism. The next time you hear someone claim it is, do the world a favor and call them on it. ::