explain U.S. patent 6,630,507, which affirms medical benefits of marijuana, and is owned by the United States government

The DEA justifies marijuana's classification as a schedule 1 substance by insisting it has no medical properties. However, since October of 2003, the United States of America as represented by the Department of Health and Human Services has owned the rights to U.S. patent 6,630,507, entitled "Cannabinoids as antioxidants and neuroprotectants." The patent's abstract states that cannabinoids (which are found in marijuana) have antioxidant properties and are useful for treating and preventing "ischemic, age-related, inflammatory and autoimmune diseases," and also have neuroprotectant properties which can limit the damage caused by "stroke and trauma," and can be used to treat "Alzheimer's disease, Parkinson's disease and HIV dementia." Therefore, marijuana should not be a schedule 1 drug.