Sativex, produced by GW Pharmaceuticals in Britain, brings the medical marijuana debate full circle. Though the technology has advanced in 70 years, this product is a direct descendent of the marijuana extracts and tinctures that were a standard part of the medical armamentarium until the late 1930s — universally recognized as being safe and effective for certain conditions. These products were taken away from patients and doctors as a result of the prohibition on marijuana that began in 1937, despite the public opposition of the American Medical Association.