In the Bible you can read all sorts of stuff about False Prophets, mostly in the Old Testament. In short, God didn't talk to them, but they went around saying, "God told me to tell you ____________." Or they went around making pronouncements of what would happen in the future, and perhaps why. Or they would say an event happened because of some reason, and they would point to God as having caused it for ____________ reason.
Since many people may not be familiar with the concept of False Prophets, let's compare them to another group which many people are familiar with.
False Prophets are similar to, but not exactly like, today's "Yes-Men." As you may know, Yes-Men are people who kiss butt, pander, they claim their masters do no wrong, they lavish praise on their overlord(s) and deride all opposition, no matter what the facts are. In short, they've sold their souls to beings other than the one true God.
Simple Comparison: Yes-Men & False Prophets
Facts don't matter to Yes-Men or False Prophets. If the facts seem to line up with what they say, then they tout them. If the facts do not line up with what they say, the facts are ignored, misrepresented, or bent in some crooked way. Yes-Men told the emperor his clothing of moonbeams was the finest in all creation, ignoring the fact the emperor was strutting stark naked for all to see; all of them being hoodwinked by a lie they knew was a lie, but were too cowardly to acknowledge.
This concept, and modified title, is used quite effectively as the basis of another book which deals specifically with marijuana prohibition.
There is not a complete overlap between Yes-Men and False Prophets. Yes-Men, for the most part, don't claim to speak for God. False Prophets, on the other hand, have little problem going around telling people they speak for God, or implying it. However, not all False Prophets make overt statements about speaking for God. They go around making proclamations about what the future holds, and generally, make pronouncements as to why events happened the way they did, or will happen the way they do.
False Prophets of Prohibition
The False Prophets of Prohibition are nearly identical to the False Prophets of ages gone by. False Prophets of Prohibition say things like "we can have a drug free America," and "we should have the goal of a drug free world."