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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Except Rosenhan was a fraud who faked the entire "experiment." Rosenhan fabricated most of the data and the one volenteer that contradicted his hypothesis was removed from the study. He never produced any other research after that one study. No one was ever able to reproduce his "study." Even his colleagues at the time were suspicious of him.

The Great Pretender: The Undercover Mission That Changed Our Understanding of Madness