If this is at the threshold of your knowledge in this area, there's a heck of a lot more to learn. This whole article, with some interesting facts about a few cherry-picked researchers, emanates naivete.
OK, but that's no different than any of the people in the Star Slate Codex article. If anything the people doing thumbprints are much more likely to have taken actual LSD than the people getting it indirectly from Sandoz since they were making it themselves.
But Owsley apparently did a great job from what I hear =p
> [Epistemic status: very speculative, asserted with only ~30% confidence. On the other hand, even though psychiatrists don’t really talk about this it’s possible other groups know this all already]