(Peterson et al. 440) It is difficult to make the distinction between symptoms and normative factors and then prove direct causation to a crime. There are people who exhibit some psychotic symptoms, but as a normative trait rather than a mental disorder. The researchers defined “direct crime” as one in which symptoms “immediately preceded the crime and increased its likelihood of occurrence.” (Peterson et al. 441) One finding shows that general risk factors affect both offenders with mental illness and those without. (Peterson et al. 441) It even appears as those who commit crimes on the basis of insanity sometimes commit crimes based on risk factors suffered by non-mentally ill offenders. (Peterson et al.
(Peterson et al. 440) It is difficult to make the distinction between symptoms and normative factors and then prove direct causation to a crime. There are people who exhibit some psychotic symptoms, but as a normative trait rather than a mental disorder. The researchers defined “direct crime” as one in which symptoms “immediately preceded the crime and increased its likelihood of occurrence.” (Peterson et al. 441) One finding shows that general risk factors affect both offenders with mental illness and those without. (Peterson et al. 441) It even appears as those who commit crimes on the basis of insanity sometimes commit crimes based on risk factors suffered by non-mentally ill offenders. (Peterson et al.