The federal Farm Bill forbids states from preventing the transportation of hemp, and a Colorado company that wants its seized shipment back from Idaho is citing the Farm Bill in a court filing against the state.Still, the Ada County prosecuting attorney’s office argues that hauling hemp through Idaho is illegal and that the seizure was lawful.An Oregon trucker who claims he was hauling hemp from Oregon to Colorado through Idaho was arrested on Jan. 24 on the east side of Boise, and Idaho State Police seized 6,701 pounds of the green leafy substance, which tested positive for THC, the psychoactive ingredient in marijuana.The amount of THC is an important detail.Hemp, while not a scheduled substance, contains trace amounts of THC but not enough to produce a high. Under federal regulations, hemp must contain 0.3 percent or less of THC.