Post hoc ergo propter hoc, a logical fallacy which states that just because b came after a, does not mean that a caused b. The problem with this is that the states still have more control over drug control than the federal government, so even if the federal government legalizes, let's say medical marijuana, the states can still control and constrict supply and prescriptions enough to make it difficult to obtain. So, I take it today's English class was a very informative one, then? Don't be a douche. And besides, you're not even right on the subject. It's probably more of a Philosophy class than an English class.