How can you tell when someone is feigning insanity?

Good question indeed. I worked in a mental hospital for a little over a year and I saw some interesting cases to say the least. Some people in theses places actually hide there to escape or delay criminal prosecution. They know the hospital can not disclose their whereabouts to just anyone. Anyway, these people often exhibit behavioral rather then mental disorders like schizophrenia or true psychotic episodes. The patient will act out in a calculated fashion and often will do so for attention and a longer stay at the hospital. Some even fake insanity for the high of the drugs they receive. Fakers can often be bargained with more readily than a true psychotic person because they know what they are doing and know how to work the system. For example: A person going through a paranoid episode would not just stop with the promise of an extra cigarette or extra food, but the fax psycho may relent more readily with the same promise thus using simple behavior tactics to gain what they want. Make no mistake though, those fakers have issues too that need to be addressed.