I have occasionally thought about hauling illegal items such as drugs that a shipper loaded on my van without my knowledge. Industrial hemp, back in the day we called ditch weed or Minnesota Green, I would probably decline hauling. If it contained any trace of THC, depending on the state traveling through would probably be illegal. Oregon to California probably wouldn't be a problem but before hauling I would want some type of confirmation in writing from the shipper that it was in fact legal.
Curious, what was the weight and size? Was it a van, truck or tractor/trailer load?