FILE - In this June 17, 2015, file photo, medical marijuana plants grow at LifeLine Labs in Cottage Grove, Minn. When U.S. Attorney General Jeff Sessions green-lighted federal prosecutors to pursue violators of federal marijuana laws, not only states that legalized recreational pot are at risk of a crackdown, but so is most of the rest of America. All but four states allow some form of medical marijuana, even Sessions' home state of Alabama. (AP Photo/Jim Mone, File)