CAT/C/USA/CO/2 page 9 34. The Committee reiterates the concern expressed in its previous recommendations about the conditions of the detention of children, in particular the fact that they may not be completely segregated from adults during pretrial detention and after sentencing. The Committee is also concerned at the large number of children sentenced to life imprisonment in the State party (art. 16). The State party should ensure that detained children are kept in facilities separate from those for adults in conformity with international standards. The State party should address the question of sentences of life imprisonment of children, as these could constitute cruel, inhuman or degrading treatment or punishment. 35. The Committee remains concerned about the extensive use by the State party’s law-enforcement personnel of electroshock devices, which have caused several deaths. The Committee is concerned that this practice raises serious issues of compatibility with article 16 of the Convention. The State party should carefully review the use of electroshock devices, strictly regulate their use, restricting it to substitution for lethal weapons, and eliminate the use of these devices to restrain persons in custody, as this leads to breaches of article 16 of the Convention. 36. The Committee remains concerned about the extremely harsh regime imposed on detainees in “supermaximum prisons”. The Committee is concerned about the prolonged isolation periods detainees are subjected to, the effect such treatment has on their mental health, and that its purpose may be retribution, in which case it would constitute cruel, inhuman or degrading treatment or punishment (art. 16). The State party should review the regime imposed on detainees in “supermaximum prisons”, in particular the practice of prolonged isolation. 37. The Committee is concerned about reports of brutality and use of excessive force by the State party’s law-enforcement personnel, and the numerous allegations of their ill-treatment of vulnerable groups, in particular racial minorities, migrants and persons of different sexual orientation which have not been adequately investigated (art. 16 and 12). The State party should ensure that reports of brutality and ill-treatment of members of vulnerable groups by its law-enforcement personnel are independently, promptly and thoroughly investigated and that perpetrators are prosecuted and appropriately punished. 38. The Committee strongly encourages the State party to invite the Special Rapporteur on torture and other cruel, inhuman or degrading treatment or punishment, in full conformity with the terms of reference for fact-finding missions by special procedures of the United Nations, to visit Guantánamo Bay and any other detention facility under its de facto control. 39. The Committee invites the State party to reconsider its express intention not to become party to the Rome Statute of the International Criminal Court.