CRC/C/GC/10 page 21 commission of the offence. It means that a death penalty may not be imposed for a crime committed by a person under 18 regardless of his/her age at the time of the trial or sentencing or of the execution of the sanction. 76. The Committee recommends the few States parties that have not done so yet to abolish the death penalty for all offences committed by persons below the age of 18 years and to suspend the execution of all death sentences for those persons till the necessary legislative measures abolishing the death penalty for children have been fully enacted. The imposed death penalty should be changed to a sanction that is in full conformity with CRC. No life imprisonment without parole 77. No child who was under the age of 18 at the time he or she committed an offence should be sentenced to life without the possibility of release or parole. For all sentences imposed upon children the possibility of release should be realistic and regularly considered. In this regard, the Committee refers to article 25 of CRC providing the right to periodic review for all children placed for the purpose of care, protection or treatment. The Committee reminds the States parties which do sentence children to life imprisonment with the possibility of release or parole that this sanction must fully comply with and strive for the realization of the aims of juvenile justice enshrined in article 40 (1) of CRC. This means inter alia that the child sentenced to this imprisonment should receive education, treatment, and care aiming at his/her release, reintegration and ability to assume a constructive role in society. This also requires a regular review of the child’s development and progress in order to decide on his/her possible release. Given the likelihood that a life imprisonment of a child will make it very difficult, if not impossible, to achieve the aims of juvenile justice despite the possibility of release, the Committee strongly recommends the States parties to abolish all forms of life imprisonment for offences committed by persons under the age of 18. F. Deprivation of liberty, including pretrial detention and post-trial incarceration 78. Article 37 of CRC contains the leading principles for the use of deprivation of liberty, the procedural rights of every child deprived of liberty, and provisions concerning the treatment of and conditions for children deprived of their liberty. Basic principles 79. The leading principles for the use of deprivation of liberty are: (a) the arrest, detention or imprisonment of a child shall be in conformity with the law and shall be used only as a measure of last resort and for the shortest appropriate period of time; and (b) no child shall be deprived of his/her liberty unlawfully or arbitrarily. 80. The Committee notes with concern that, in many countries, children languish in pretrial detention for months or even years, which constitutes a grave violation of article 37 (b) of CRC. An effective package of alternatives must be available (see chapter IV, section B, above), for the States parties to realize their obligation under article 37 (b) of CRC to use deprivation of liberty only as a measure of last resort. The use of these alternatives must be carefully structured to reduce the use of pretrial detention as well, rather than “widening the net” of sanctioned children. In addition, the States parties should take adequate legislative and other measures to reduce the