From The Largest Minority:
The United States is the only industrialized nation where hemp is not an established crop, much to the delight of oil, coal, and chemical industries which benefit from the ban.
Cultivation of hemp is currently illegal under US federal law thanks to the lobbying of the aforementioned groups. The California Narcotic Officers’ Association has testified that the passage of such a bill would only make law enforcement more difficult because farmers might hide illegal marijuana in their legal hemp fields. I could be wrong, but it seems like this association is either admitting that they’re too incompetent to do their jobs correctly, or they’re making the case for the legalization of marijuana so that they’re not forced to make the distinction. Either way, I say let the layoffs begin.