Sales associate Matt Hart uses a pair of chopsticks to hold a bud of Lemon Skunk, the strain of highest potency available at the 3D Dispensary, on Friday, Dec. 19, 2014, in Denver. 

(AP Photo/David Zalubowski)

Kansas hasn't decided whether to join a lawsuit filed by other states against Colorado over its legalization of marijuana even though the two states share a border.

Spokeswoman Jennifer Rapp said Friday that Kansas Attorney General Derek Schmidt has been considering legal action against Colorado for months.

But she said in an email that his office is still weighing its options.

Nebraska and Oklahoma filed a lawsuit Thursday with the U.S. Supreme Court, asking it to declare Colorado's legalization of marijuana unconstitutional. They argue it's a public safety issue.

They're seeking to prevent Colorado from enforcing an initiative approved by voters in 2012 to legalize marijuana despite federal laws against it.