In ASA vs. DEA, the DC Circuit was asked to decide whether the DEA properly classified Marijuana as a Schedule1 drug--a drug having no accepted medical use. The court concluded that the DEA did not abuse its discretion in concluding that as of 2011-the scientific studies do not support a conclusion that marijuana has an accepted medical use. The court supported the DEA assessment that simply because States are making marijuana legal under state law does not affect scientific acceptance. In the absence of scientific studies, DEA can continue to keep marijuana as a Schedule 1 drug.
The full Opinion may be found here:ASA vs. DEA (2012)