makes medicines from the actual marijuana plant. now, although this is done with the express permission of the uk government, we did have to sign confidentiality agreements and cannot disclose exactly where we're going to be located. you see, marijuana is illegal in just about every part of this country, except for the secret labs we're about to enter. >> wow! this is pretty spectacular. are you used to the smell? >> i'm not particularly partial to the smell. >> if you had smellevision on your tv, you would be overpowered by now. it's a lot of pot. this greenhouse is the size of a football field, and they have several more just like it throughout the united kingdom. the lighting, temperature, humidity, all monitored by a top