DENVER (AP) — Medical and recreational marijuana may be legal in Colorado, but employers in the state can lawfully fire workers who test positive for the drug, even if it was used off duty, according to a court ruling Thursday. The Colorado Court of Appeals found there is no employment protection for medical marijuana users in the state since the drug remains barred by the federal government. "For an activity to be lawful in Colorado, it must be permitted by, and not contrary to, both state and federal law," the appeals court stated in its 2-1 conclusion.