Psychopathy, schizophrenia, narcissism, persecutory delusions and paraphilias: what science says and what an investigator needs to know

Cinema has accustomed us to the 'criminal madman' and the profiler who reads the killer's mind. The scientific literature tells another story: most people with a mental disorder are not violent, profiling has documented limits, and psychiatric labels misused cause harm. A rigorous guide to psychopathy, schizophrenia, persecutory delusions, narcissism and paraphilias, and what they really mean for anyone who conducts investigations.