I suppose if they lie enough about the constitution, it really will contain a statement pointing to why drugs should be legal.
Perhaps you would like to give an exact quotation followed by article and section from the US Constitution that gives it the authority to regulate drugs within state borders. Oh yeah, that article and section wouldn't exist because the federal government has no intrastate commerce regulatory powers unless you consider prosecuting slavery and counterfeiting intrastate commerce. While you're at it, read the 10th amendment. It states clearly and unequivocably that any power not explicitly granted to the US Government is one that the US Government doesn't have. This isn't about morality, it is whether do-gooder hyper-moralist thugs would violate the US Constitution; it is a litmus test for the orthodoxy of your adherence to the US Constitution.