An anonymous reader writes: A patent for CBD treatment of non-responsive epilepsy has been granted to GWPharma (owner of patent for synthetic THC — Sativex) in June of 2014. However, Sanjay Gupta's "Weed" documentary shows that this treatment was developed far earlier by a group in Colorado. As far as my understanding of patents goes, they should only be granted for a "novel" application. Not counting the fact that marijuana derivatives have been used as medicine for thousands of years, clearly this application is not new. Couldn't this patent be challenged in court?