further assessed and, in some cases, a Section 2 assessment order or Section 3 treatment order implemented. Informal Patients Section 131 allows for patients to be voluntarily admitted as an inpatient, and voluntarily remain after other sections cease to apply. Voluntary inpatients may be prevented from leaving by a nurse under section 5(2) or any physician under section 5(4) for 72 hours before being assessed for commitment through section 3 or section 2. Criminal sections Part III and other various criminal sections of the Act apply to sentenced prisoners and persons subject to proceedings of the criminal justice System. Although they are invariably implemented by a court, often upon the recommendations of one or more psychiatrists, some of these sections largely mirror the civil sections of the Act. Pre-trial orders Section 35 and Section 36 are similar in their powers to Section 2 assessment orders and Section 3 treatment orders respectively, but are used for persons awaiting trial for a serious crime and provide courts with an alternative to remanding a mentally disordered person in prison. The order for Section 35 can be made by the Crown Court or a magistrates' court, whilst Section 36 can be enacted only by a Crown Court. Courts can enact either of these sections on the medical recommendation of one Section 12 approved doctor. Both these sections are rarely used in practice. Post-trial orders Section 37 is a treatment order, similar in many regards to the civil treatment order under Section 3, and is fairly frequently used. It is applied to persons recently convicted of a serious crime, which is punishable by imprisonment. Thus it represents an alternative to a mentally disordered person being punished by imprisonment or otherwise. It is enacted by the Crown Court or a magistrates' court on the recommendation of two approved doctors. However, the court is able to exercise discretion in this regard and can impose a prison sentence despite medical recommendations for Section 37. A person detained under Section 37 can appeal to the Mental Health Review Tribunal after a period of six months; if they are no longer experiencing symptoms of mental disorder, the person can be discharged by the Tribunal, even if there is a strong possibility that the person might relapse and re-offend. Furthermore, a person on Section 37 alone, who may have been convicted of a serious violent crime, can be discharged in the