This experiment investigated whether psychotherapy combined with the psychoactive drug psilocybin, derived from hallucinogenic mushrooms, could help rehabilitate imprisoned criminals and keep them from recidivating upon regaining their freedom. A team of Harvard University researchers, led by experimental psychologist Timothy Leary, conducted the experiment from 1961 to 1963 at Massachusetts’s Concord State Prison, a maximum security prison for young offenders. What were the initial results? Discuss