[samatman]

The Good Friday experiment used an "active placebo" in the form of a low dose of amphetamines.

Doesn't help: any normal person can tell the difference between a full dose of psilocybin and a low dose of amphetamines.

[corin_]

Does the patient need to know which drug is being tested?

"You'll be given either a psychedelic or a stimulent, followed by x testing" - then knowing which drug you're getting doesn't mean you know if you're in the placebo group or not?