Colorado defended its pot law for the first time Friday in a filing to the U.S. Supreme Court. Yesterday was the deadline for Colorado to respond to a legal challenge from Oklahoma and Nebraska. The lawsuit challenges Colorado’s legalization of recreational marijuana and is one of four lawsuits that aim to dismantle the young industry. Colorado’s neighbors claim that the 2012 pot legalization vote has sent the drug flooding across Colorado’s borders. Three other lawsuits have been filed since Nebraska and Oklahoma sued. One was filed by a hotel owner in Colorado who argues legal weed is hurting his business. Another is from a southern Colorado landowner who says legal weed is hurting property values. The fourth lawsuit comes from county sheriffs in Colorado, Nebraska and Kansas.