Following a series of statements critical of medical and recreational marijuana in states, US Attorney General Jeff Sessions formally rescinded guidance documents issued during the Obama administration. AG Sessions explained the former policy guidance was unnecessary.
Formally rescinding the Cole memo and other guidance documents issued during the Obama administration signals an about-face on the marijuana experiment. Federal courts will undoubtedly affirm the federal government's authority to enforce federal law. To the extent state laws conflict, they will be struck down. Absent a change in federal law, AG Sessions and the US Attorneys have the authority to quickly shut down medical and recreational marijuana sales.
The full memo is here: Sessions Recind's Cole Memo Jan 5 2018.pdf