BOISE, Idaho (AP) — The U.S. Department of Agriculture says states can't block the interstate transportation of hemp, but law enforcement in Idaho says it won't follow those guidelines.

Hemp doesn't get a person high, but it still contains trace amounts of the chemical THC, which is found in marijuana. Under Idaho law, any amount of THC is illegal.

The USDA released a memo Tuesday saying states can't block any interstate shipment because hemp was legalized under the 2018 Farm Bill. That opinion isn't legally binding.

But an Idaho State Police spokesperson says they will continue to make arrest...