Will Jeff Session’s war on medical marijuana start next week? The deadline for Congress to vote on federal law enforcement against medical marijuana in legal states is December 22. Remember, Congress got a last-minute, two-week extension to figure out the federal budget before the Holidays, now they have to decide whether to include the Rohrabacher-Farr amendment in the appropriations bill. The amendment basically prevents the DOJ from spending any money to prosecute marijuana users in legal states.