Assistance institutions alternative to prison and reprieve in Law on Reducing the Punishment of Imprisonment, approved in 1399

One of the important aims of punishment is the reform and treatment of criminals that this may be achieved by applying the principle of individualization of punishments. Therefore the most important concerns of the criminal justice system of any country is the prevention of crime or decline harmful effects of the retributive imprisonment. In this regard, the legislator has carried out and authorized new changes and developments under the name of reducing the discretionary imprisonment of law approved in 1399. Therefore with the establishment of assistance institutions that have aid approaches and they are trying to provide the basis for rehabilitation of the convicted punishment, but assistance cases are legal institutions that are driven of corrective justice and their aims are reform the offender and compensate the damage suffered and regenerate the society . In the Islamic law penal code 1392, institutions such as parole system, semi-liberty and alternative to prison, reprieve and in the criminal procedure law item such as appointment to abandon prosecution, stop the investigation and limit detentions are examples of assistance institutions. In the present research we analyze and review institutions alternative to prison, reprieve in the law on reducing of the punishing imprisonment. The research findings show legislator in the basis of assistance institutions alternative to prison and reprieve has made new changes and developments in the Law on reducing punish of imprisonment made a policy that use these institutions has had a noticeable effect in order to reduce the current criminal population, efface prison and costs paid by society for crime.