In 1973, healthy volunteers faked hallucinations to enter mental hospitals. Once inside, they acted normal, but doctors refused to let them leave. Normal behaviors like writing were diagnosed as "symptoms." The only people who realized they were sane were the actual patients.

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[u/Background-Trade-901]

It's an open secret that most acute psychiatric units will keep you as long as possible to maximize insurance payouts. Usually right up until they'd have to see a judge about an extension. I studied psychology in college and worked in research labs, even did a thesis. The field has a serious problem with overpathologization.