Colorado is already being sued by two neighboring states for legalizing marijuana. Now the state faces an additional federal lawsuit. Plaintiffs who oppose legal weed are appealing to federal courts to try to shut down Colorado’s $800-million-a-year marijuana industry. They plan to announce details of the claim today at the state Capitol. The lawsuit is being sponsored by a group called the Safe Streets Alliance. The group is based in Washington D.C. and opposes marijuana legalization. Colorado is also being sued by Nebraska and Oklahoma for legalizing marijuana in 2012. In that case, Colorado has until March 27th to tell the U.S. Supreme Court why it thinks Nebraska and Oklahoma are wrong.