California has had legal medical marijuana for over 13 years, and more than 80% of Americans support patients' rights to use it. But none of that mattered to Christian Hughes’ employer, who fired him for testing positive for marijuana that he uses under his doctor’s recommendation to treat injuries related to an auto accident. Hughes, 33, was the on-site manager for a senior apartment complex in Anderson, California until his recent termination by MCA Housing Partners. The resident senior citizens…