On Jan. 4, Attorney General Jeff Sessions rescinded the Cole memo, a 2013 document that limits federal enforcement of marijuana laws.
This opens the door for a crackdown in the nine states with legal recreational marijuana.
The Cole memo is one of two documents that prevent the U.S. Justice Department from treating marijuana as a Schedule I drug, defined as a substance with no accepted medical treatment and high potential for abuse. The other is the 2014 Rohrabacher–Farr amendment. This legislation bars the Department of Justice from spending any funds to keep states from implementing their own laws about “the use, distribution, possession or cultivation of medical marijuana.”