A big decision...

They could, but they shouldn't really have to. The DEA shouldn't be making laws in the first place. It's akin to if the police made the laws. You don't want the people who are enforcing and profiting off of the laws to be the same people writing the laws. There's a serious conflict of interest there. It is in the DEA's best interest for substances to be controlled because it gives them a purpose and keeps them their jobs.

Which is basically the entire story of Alcohol prohibition being defeated, and the war on 'Drugs' beginning aka marijuana. They actually gave Ganga a spanish name to make white people more afraid of it, because they knew how to perpetuate stereotypes. Clever!