Authorities say Colorado apparently has more medical marijuana than it can use, and some of the excess is showing up in Nebraska -- illegally.

Scottsbluff Police Alex Moreno told the Lincoln Journal Star that the Colorado pot has shown up in his town and around Sidney.

Licensed patients in Colorado can have 2 ounces of usable marijuana and no more than three mature plants. But because the plants can produce up to a pound each, the surplus could reach into dozens of tons.

The pot is showing up in traffic stops, too.

Lt. Lance Rogers of the Nebraska State Patrol says travelers often have cards that say they can legally possess the pot in Colorado. But, he says, Nebraska doesn't have such a law, so the Coloradoans are cited.