ALISON STEWART:

Employees at the store are trained to look out for customers who might break the law. The dispensary also displays signs detailing the marijuana laws of Colorado and neighboring states.

Yet there is still an influx of pot coming into Nebraska and Oklahoma. So the Attorneys General of both states filed a lawsuit in the U.S. Supreme Court in December, alleging that they, "have suffered direct and significant harm arising from the increased presence of Colorado-sourced marijuana."

Nebraska and Oklahoma also contend that Colorado's marijuana law "directly conflicts with federal law and undermines…the area of drug control and enforcement."

And so both states are asking the Supreme Court to declare Colorado's marijuana law unconstitutional and in doing so, undo Colorado's marijuana regulatory system.

But this past March, Colorado asked the Supreme Court to drop the lawsuit. Washington and Oregon – states that also legalized the possession and sale of marijuana – immediately came out in support of Colorado's request. The Supreme Court has yet to decide whether to take up the case.

Bill Kelly is a reporter with Nebraska's public radio station NET who's been covering the issue. We video chatted with him because he's based in the state's capitol Lincoln, over 300 miles away from where we were reporting at the Nebraska/Colorado border.