The “rational basis” here is that North Dakota farmers can’t grow tall, reedy hemp plants that could never ever get anyone high, because that will confuse the law enforcement officials who are working to eradicate short bushy cannabis plants that are grown to get people high. Somehow, in Australia, Canada, and China to name a few countries, police who are tasked with eradicating illegal cannabis in those countries that have legal hemp have no difficulty whatsoever distinguishing the two crops, but American police are just baffled by basic agriculture.