Under the CSA, the DEA is given considerable, though not complete, authority over the scheduled status of drugs. DEA maintains the registration of drugs, and scheduled drugs receive a DEA number. The DEA can move to change or remove a drug from its scheduled class. They have not in the case of cannabis so moved. When Americans for Safe Access (ASA) sued to remove cannabis from schedule 1, they sued the DEA. To add a drug requires concurrence of HHS. Mr. O could, by the stroke of a pen, remove cannabis from schedule 1. Obviously, he too prefers things as they are.