Yeah, it’s a weird thing to test for. Sort of like trying to double-blind broken bone procedures with a hard cast for the experimental group, and an Ace bandag

Yeah, it’s a weird thing to test for. Sort of like trying to double-blind broken bone procedures with a hard cast for the experimental group, and an Ace bandage for placebo. All parties can tell the difference while it’s being applied. Maybe it requires a different kind of experimental structure that still allows for single-blind follow-ups. Imagine the subjects talking a different set of therapists or researchers after 1 month, 3 months, 6 months. The patients/subjects would have to be instructed not to talk about whatever they experienced during the psilocybin/placebo phase, only about their personal development since then: outlook on life, lifestyle changes, etc. The therapists would have to self-invalidate if anything was divulged by a patient. It would probably have to be a large group, since with 1000 people you might only get 300 therapist-blind reports.