Drug prohibition (I include medical drugs) is a tricky one as in most cases we fly blind with limited or unreliable scientific studies, compounded by the reproducibilty problem and fact that we can't just do direct tests on humans! But I do agree that there is a problem of mixed standards with drugs of all types (legal and illegal).
When you mean Congress, are you speaking of the top level government? So, not states in America? I still find it a good aspirational guide, but I think it is a bit too broad to apply broadly... (that came out ineptly...)....