As various states have “legalized” cannabis sales, and refused to enforce federal law, many businesses have grown to sell the stuff. But the good times may be over for these drug dealers.

The entire “legalized pot” industry has depended on the states refusing to enforce federal law (their right under federalism), but also on a lack of federal agents going after them directly. But according to the Associated Press, that’s going to change:

The move will leave it to U.S. attorneys where pot is legal to decide whether to aggressively enforce federal marijuana law. The move likely will add to confusion about whether it’s OK to grow, buy or use marijuana in states where it’s legal, since long-standing federal law prohibits it.

The decision comes days after California began selling recreational marijuana.

Federalism cuts both ways, and elections have consequences.