Weak mental retardation due to weakness of will and lack of focus on various issues has more in common with idiocy expressed in the view of jurists and jurists, and they are among the examples of idiocy. At the same time, the weak will of mentally retarded people is not limited to financial matters, and they do not have enough growth in non-financial matters, and they have a wider stone than the stupid, so they should be supported in the form of a special type of recluses. In fact, these people are also minors. Even though severe mental retardation are not called insane mystics, but according to their lack of permanent intention and will, they are equal to insane according to the legal principles and regulations. The legislator in Article 91 of the Islamic Penal Code approved in 2012 regarding the application of maximum punishment Or retribution on adults under the age of eighteen, implicitly, it is necessary to determine the criminal growth of the perpetrator, which has caused a difference among doctors and judicial procedures, and it is not clear that upon reaching the age of puberty, the principle is based on the criminal growth, or The principle of non-penal growth? Penal growth means reaching the age when a person has the ability to discern and fully recognize the good and bad of actions and understand the Shariah and legal prohibitions. The criterion of criminal responsibility is the age of maturity and the absence of insanity and stupidity. This article tries to deal with the comprehensive definition and hindrance and examine the status of insane, stupid, and rashidjezai people and how to diagnose them in forensic medicine. This article uses Descriptive, analytical and library methods have been compiled.