Industrial hemp
Did the farm bill legalize hemp (aka Cannabis stativa) at the federal level? Is CBD oil made from hemp? Has CBD oil caused people to test positive for THC? Can drivers who transport hemp test positive for THC in a hair test if their hair becomes contaminated by the load of hemp they hauled? If the answer to any of this is yes then how does the 4th amendment affect the government when it comes to establishing a drug testing policy for drivers?