you know pete carol said he's considering. >> because there's evidence it helps with concussions. >> that's right. in fact, the united states holds a patent on marijuana for that very reason, as a neuro protect aunt against stroke and trauma. obama has said look, i don't think it's anymore dangerous than alcohol. i think it can stand on its own merits. but that's part of the frustration. people are saying one thing but then acting very differently. >> often, negativity becomes a proxy for insight. people don't like pot so they don't want to listen to what you're saying. >> that's right. >> yes, i like sanjay, but you're saying if for categories of real illness you're limiting the discussion to and when nothing else has worked.