While the the American Medical Association claims pot has no medical value, Big Pharma is busy getting patents for marijuana products.
The US government's longstanding denial of medical marijuana research and use is an irrational and morally bankrupt public policy. On this point, few Americans disagree. As for the question of "why" federal officials maintain this inflexible and inhumane policy, well that's another story
One of the more popular theories seeking to explain the Feds' seemingly inexplicable ban on medical pot goes like this: Neither the US government nor the pharmaceutical industry will allow for the use of medical marijuana because they can't patent it or profit from it.