A cultured society need not throw a man like Timothy Leary in jail. You have so many scientists, let them prove what he is saying is wrong. There is no need for any court, for any law to come into it.
And if he is right then he should be accepted, then he should be received as a messiah because he is bringing a new way of transformation. If he is right, welcome him. If he is wrong, prove him wrong; that's enough.
This is very primitive, ugly, to throw him into jail because he is saying something which goes against the law. But who told you that the law is anything ultimate? You have made the law. Science goes on progressing. You will have to change your laws if they go against science; science is not to be prevented.