>> well, one of the reasons possibly is because the thc works better when cannabidiol is there. both, it works better. >> mashula calls it the entourage effect, and that's what g.w. is doing. every extract will have all the plant's chemicals in it. the extract is then packaged as an approved prescription spray. in order to increase the chances of getting that approval, every step from growing to harvesting, to manufacturing, is all carefully controlled, regulated and rigorously tested to strict standards. so that every plant, every ex-tracex tra tract, every dose is identify, safe, and effective. it is an expensive and painstakingly slow process. it's taken hundreds of millions of dollars and a decade to develop their first drug for the unrelenting pain and spasms brought on by multiple sclero s sclerosis. >> is this a place that you walk? >> as a neurosurgeon, myself, i was curious how well this medicine could work. theresa pointer was diagnosed with ms in february of 2004. for years she struggled with pain and exhaustion. she tried just about everything, but found the drugs pr