Attorney General Jeff Sessions has rescinded a policy that discouraged prosecutors from enforcing federal laws against marijuana in states that have decriminalized the drug, The New York Times reports.

In a statement, Sessions said that his memo to United States attorneys directs them “to use previously established prosecutorial principles that provide them all the necessary tools to disrupt criminal organizations, tackle the growing drug crisis, and thwart violent crime across our country.”

While marijuana remains illegal under federal law, the drug has been at least partly legalized—including for medicinal use—in 29 states and the District of Columbia. California began allowing the sale of recreational marijuana on January 1.

Sessions’ move is likely to increase the confusion about whether it is legal to buy, sell or possess marijuana in states where federal and state law conflict, the article notes.