In the wake of a U.S. Supreme Court decision not to hear his state’s challenge to neighboring Colorado’s legalization of marijuana, Nebraska Attorney General Doug Peterson is pledging to “determine the best next steps toward vindicating the rule of law.” Oklahoma joined Nebraska in the lawsuit. It was filed directly to the U.S. Supreme Court without going through a lower court — an action that is allowed when states have legal complaints with another, SCOTUSblog.com reports.