Idaho state officials like to declare how their state is open for business, and in many respects it is. But in some areas it is fiercely stubborn — to the point of blocking interstate commerce.

Such as commerce in hemp.

Late last year a new federal farm bill passed legalizing on a national level commerce and transport of hemp, a plant product genetically similar to marijuana (both are considered forms of cannabis) but without its psychotropic capabilities. Hemp, remarkable versatile, is used...