Tweet Donald Abrams, M.D. is chief of Hematology and Oncology at San Francisco General Hospital and the co-author—with Andrew Weil—of Integrative Oncology (Oxford University Press). Abrams has extensive experience working with cancer and HIV/AIDS patients and is a pioneer in the field of medical cannabis research.  The U.S. government classifies cannabis—along with heroin and LSD—as a Schedule I drug, the most tightly restricted category of drugs in the United States. According to the federal government, Schedule I drugs are unsafe and have "no currently accepted medical use in treatment in the United States." However, as medical cannabis proponents have pointed out since the Controlled Substances Act was passed by Congress in 1970, cannabis has been used medicinally for thousands of years, and there has never been a reported case of a marijuana overdose. Moreover, in recent years clinical researchers around the world have demonstrated the medicinal value of cannabis. Reason.tv’s Paul Feine sat down with Dr. Abrams to learn more about the science of medical cannabis.