DENVER (AP) — Hundreds of pounds of industrial hemp seeds bound from Canada to Colorado have been seized by federal authorities in North Dakota, marking the latest bump along the road to legalization of marijuana’s non-intoxicating cousin.

At the center of the dispute is hemp activist Tom McClain. Armed with a copy of last year’s federal Farm Bill, which allowed states to permit hemp cultivation for research and development, he set off for MacGregor, Manitoba, and bought 350 pounds of seeds used to grow a strain known as X-59 or Hemp Nut.