Timothy Leary really so discredited a scientific approach to studying this, because he may have started off doing interesting research, and then got into advocating use in a way that was incredibly threatening." Culturally, we reacted, and politically, it became impossible to do this sort of research. Funding agencies didn't make resources available. Regulatory agencies increased the practical hurdles for initiating this kind of research. And I think people who had interest in research of this type largely were discredited because of their interest in the research. Social, political and scientific issues that came together pushed these drugs out of the scientific marketplace.