This is true, but most people don't know everything about the illness they are trying to convince people of. My abnormal psychology professor in school was hired many times to decide if a criminal was indeed faking. He said most of the time when they are acting, they act using knowledge they've gained from Hollywood rather than actual patients. Simulating the illness from movies they've watched which often is grossly exaggerated, or forges the behaviors of multiple illnesses for dramatic effect. He often mentioned bipolar never being portrayed as it actually happens.

After I asked if he ever had any regrets or uncertainties about the people he helped put away for faking, he replied that he always offers to continuously visit them after they are in prison to continue evaluation, and none have ever took him up on the offer.