The states of Nebraska and Oklahoma are trying again to overturn marijuana legalization in Colorado, this time by asking to intervene in an ongoing court case.

Last month, the U.S. Supreme Court dismissed a proposed lawsuit brought against Colorado by the two states, leaving the states without a court to hear their complaints. Earlier this month, Nebraska and Oklahoma responded by asking to be added to a case at the 10th U.S. Circuit Court of Appeals in Denver.

That case is the consolidation of two separate appeals filed by legalization opponents whose lawsuits were dismissed by a lower court. Nebraska and Oklahoma’s motion means that all of the ongoing challenges against Colorado’s legalization of marijuana have, for the moment, merged into a single court case.

Since Colorado became the first state in country to allow licensed stores to sell marijuana to anyone over 21 years old, the state has faced a barrage of lawsuits seeking to shutter the stores. So far, none have succeeded.

Read more on denverpost.com.