On Jan. 4, U.S. Attorney General Jeff Sessions rescinded an Obama-era policy that discouraged federal prosecutors from cracking down on the sale and consumption of pot. Sessions issued a memo directing prosecutors to enforce federal marijuana laws to “disrupt criminal organizations, tackle the growing drug crisis and thwart violent crime across our country.”

State and federal laws have conflicted on marijuana for many years. It remains illegal under the federal Controlled Substances Act, despite the fact that many states have substantially decriminalized its use. Eight states and Washington, D.C., have legalized marijuana for recreational purposes, although the District of Columbia continues to ban sales. A total of 29 states have legalized marijuana for medical use.

For more, read Anna Gorman and Phil Galewitz’s “Cloud Of Uncertainty Over Legalized Pot As Feds End Obama-Era Accommodation.”