BRULE - Nebraska state troopers have arrested a man and seized 18 pounds of a marijuana extract following a traffic stop on Interstate 80 in western Nebraska.

The Nebraska State Patrol says the man was driving east when he failed to signal a turn at the Brule exit. The extract is a concentrated form called "shatter." It was found inside the door paneling. The drug's street value was estimated at more than $400,000.

The man is from Petaluma, California.