I understand that there are people and groups looking for additional guidance from this office about its approach to enforcing federal laws criminalizing marijuana cultivation and trafficking. I cannot, however, provide assurances that certain categories of participants in the state-level marijuana trade will be immune from federal prosecution.
This is a straightforward rule of law issue. Congress has unambiguously made it a federal crime to cultivate, distribute and/or possess marijuana. As a law enforcement officer in the Executive Branch, it is my sworn responsibility to enforce that law, guided by the Principles of Federal Prosecution. To do that, however, I must proceed on a case-by-case basis, assessing each matter according to those principles and deciding whether to use limited federal resources to pursue it.
Deciding, in advance, to immunize a certain category of actors from federal prosecution would be to effectively amend the laws Congress has already passed, and that I will not do. The kind of categorical relief sought by those engaged in state-level marijuana legalization efforts can only come from the legislative process.
Source: U.S. Department of Justice, Office of the United States Attorneys
