john: all we know for sure, is that theysed weed and maybe dabbled in cocaine, in a couple cases. the message now is tha crack, and meth, it gets worse, and it those are just, they automatically hook you. >> same thing was said about marijuana, in930s, peopl said, you go on to use this drug, you go to commit murder, and use heroine. a reason that it was aowed to happen there were few people who used marijuana. the same is true when w think of drugs like crack coke, and methamphetamine. not as many people use those drugs, so theest are the stories, can be made up about the drugs. because, people do not know. but, i have given thousands of doses of these drugs in my study, and i am her here to telu that the public has been misled. john: in your laboratory? you get the drugs legally. they let have you them, and you advertise? and bring users in, you recreate absolutely. >> we jump through levels of approval, we recruit participants by craigslist or advertise the village voice. jo: crack user come on in? >> wl we say people who have used cocaine before, yes,hat is right. >> and'm look