-37 and their families (CPT110, EPR111). Contacts with the family should not be prohibited (CPT112). 3.7. Specific and groups of detainees in a situation of vulnerability There are certain groups of detainees who are in particular situations of vulnerability and who should never be isolated. Group of detainees not to isolate Source Committee on the Rights of the Child, CAT, HRC, SPT, Mandela Rules, EPR, Tokyo Rules. The SRT also adds that the imposition of solitary confinement of any length on children under the age of 18 constitutes a cruel, inhuman or degrading treatment which violates Article 7 of the International Convention on Civil and Political Rights (ICCPR) and Article 16 of the CAT and should be completely prohibited. Juveniles The CPT, while recognizing the danger that solitary confinement can pose to children’s physical and mental well-being, allows solitary confinement for disciplinary reasons to be used only as a last resort and for no more than three days. Isolation for prevention or protection purposes is allowed only when absolutely no other solution can be found, and with the adequate safeguards in place. In all cases, while undergoing the measure, juveniles should be provided with socio-educational support and appropriate human contact. Finally, the CPT considers the use of calming-down rooms for the placement of a violent and/ or agitated juvenile only in highly exceptional circumstances, for a few hours, and with the health care staff alerted. 110. European Committee for the Prevention of Torture, 2011, §§56-61. 111. EPR 60.4 112. European Committee for the Prevention of Torture, 2011, §§56-61. Monitoring Solitary Confinement in Prison