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States Parties shall ensure that a child shall not be separated from his or her parents against their will, except when competent authorities subject to judicial review determine, in accordance with applicable law and procedures, that such separation is necessary for the best interests of the child. Such determination may be necessary in a particular case such as one involving abuse or neglect of the child by the parents, or one where the parents are living separately and a decision must be made as to the child's place of residence.

Where such separation results from any action initiated by a State Party, such as the detention, imprisonment, exile, deportation or death (including death arising from any cause while the person is in the custody of the State) of one or both parents or of the child, that State Party shall, upon request, provide the parents, the child or, if appropriate, another member of the family with the essential information concerning the whereabouts of the absent member(s) of the family unless the provision of the information would be detrimental to the well-being of the child. States Parties shall further ensure that the submission of such a request shall of itself entail no adverse consequences for the person(s) concerned.

Any form of detention, including detention in the course of migration proceedings, must be ordered and approved by a judge or other judicial authority. Anyone detained in the course of migration proceedings must be brought promptly before a judicial authority, before which they should have access to automatic, regular periodic reviews of their detention to ensure that it remains necessary, proportional, lawful and non-arbitrary. This does not exclude their right to bring proceedings before a court to challenge the lawfulness or arbitrariness of their detention.

Detaining children because of their parents’ migration status will always violate the principle of the best interests of the child and constitutes a violation of the rights of the child. Children must not be separated from their parents and/or legal guardians. The detention of children whose parents are detained should not be justified on the basis of maintaining the family unit, and alternatives to detention must be applied to the entire family instead.

Juveniles should only be deprived of their liberty in accordance with the principles and procedures set forth in these Rules and in the United Nations Standard Minimum Rules for the Administration of Juvenile Justice (The Beijing Rules). Deprivation of the liberty of a juvenile should be a disposition of last resort and for the minimum necessary period and should be limited to exceptional cases. The length of the sanction should be determined by the judicial authority, without precluding the possibility of his or her early release.

In application of article 37 of the Convention and the principle of the best interests of the child, unaccompanied or separated children should not, as a general rule, be detained. Detention cannot be justified solely on the basis of the child being unaccompanied or separated, or on their migratory or residence status, or lack thereof. Where detention is exceptionally justified for other reasons, it shall be conducted in accordance with article 37(b) of the Convention that requires detention to conform to the law of the relevant country and only to be used as a measure of last resort and for the shortest appropriate period of time. In consequence, all efforts, including acceleration of relevant processes, should be made to allow for the immediate release of unaccompanied or separated children from detention and their placement in other forms of appropriate accommodation.

All decisions and actions taken in relation to non-nationals below the age of 18, whether accompanied or unaccompanied, shall be guided by the right of the child to have his or her best interests taken as a primary consideration, and shall accord with the specific protections afforded to children in the present Basic Principles and Guidelines.

National legislative frameworks and migration policies shall reflect that the detention of children because of their or their parent’s migration status always constitutes a violation of the rights of the child, and contravenes the right of the child to have his or her best interests taken as a primary consideration.

Unaccompanied children who are non-nationals shall be informed about their legal status to ensure that they fully understand their situation. Public defence services and/or guardians made available to children are to be adequately trained to work with children, particularly taking into account the extreme vulnerability and need for care, and are to speak a language they understand. Children who are non-nationals should not be placed in detention centres or shelters for migrants, but in non-custodial community-based alternatives to detention, where they may receive all services necessary for their protection, such as adequate nutrition, access to quality education and leisure, care, physical and psychological medical care and security. Special attention should be given to family reunification.

Use migration detention only as a measure of last resort and work towards alternatives.

We commit to ensure that any detention in the context of international migration follows due process, is non-arbitrary, based on law, necessity, proportionality, and individual assessments, is carried out by authorized officials, and for the shortest possible period of time, irrespective of whether detention occurs at the moment of entry, in transit, or proceedings of return, and regardless of the type of place where the detention occurs. We further commit to prioritize non-custodial alternatives to detention that are in line with international law, and to take a human rights-based approach to any detention of migrants, using detention as a measure of last resort only.

To realize this commitment, we will draw from the following actions:

(f) Reduce the negative and potentially lasting effects of detention on migrants by guaranteeing due process and proportionality, that it is for the shortest period of time, that it safeguards physical and mental integrity, and that, at a minimum, access to food, basic health care, legal orientation and assistance, information and communication as well as adequate accommodation is granted, in accordance with international human rights law.

We commit to ensure that any detention in the context of international migration follows due process, is non-arbitrary, based on law, necessity, proportionality, and individual assessments, is carried out by authorized officials, and for the shortest possible period of time, irrespective of whether detention occurs at the moment of entry, in transit, or proceedings of return, and regardless of the type of place where the detention occurs. We further commit to prioritize non-custodial alternatives to detention that are in line with international law, and to take a human rights-based approach to any detention of migrants, using detention as a measure of last resort only.

To realize this commitment, we will draw from the following actions:

(h) Protect and respect the rights and best interests of the child at all times, regardless of migration status, by ensuring availability and accessibility of a viable range of alternatives to detention in non-custodial contexts, favouring community-based care arrangements, that ensure access to education and health care, and respect the right to family life and family unity, and by working to end the practice of child detention in the context of international migration.

Detention in the course of proceedings for the control of immigration is not per se arbitrary, but the detention must be justified as reasonable, necessary and proportionate in the light of the circumstances and reassessed as it extends in time. Asylum seekers who unlawfully enter a State party’s territory may be detained for a brief initial period in order to document their entry, record their claims and determine their identity if it is in doubt. To detain them further while their claims are being resolved would be arbitrary in the absence of particular reasons specific to the individual, such as an individualized likelihood of absconding, a danger of crimes against others or a risk of acts against national security. The decision must consider relevant factors case by case and not be based on a mandatory rule for a broad category; must take into account less invasive means of achieving the same ends, such as reporting obligations, sureties or other conditions to prevent absconding; and must be subject to periodic re-evaluation and judicial review. Decisions regarding the detention of migrants must also take into account the effect of the detention on their physical or mental health. Any necessary detention should take place in appropriate, sanitary, non-punitive facilities and should not take place in prisons. The inability of a State party to carry out the expulsion of an individual because of statelessness or other obstacles does not justify indefinite detention. Children should not be deprived of liberty, except as a measure of last resort and for the shortest appropriate period of time, taking into account
their best interests as a primary consideration with regard to the duration and conditions of detention, and also taking into account the extreme vulnerability and need for care of unaccompanied minors.

Paragraph 4 of article 9 entitles anyone who is deprived of liberty by arrest or detention to take proceedings before a court, in order that the court may decide without delay on the lawfulness of the detention and order release if the detention is not lawful. It enshrines the principle of habeas corpus. Review of the factual basis of the detention may, in appropriate circumstances, be limited to review of the reasonableness of a prior determination.

The right applies to all detention by official action or pursuant to official authorization, including detention in connection with criminal proceedings, military detention, security detention, counter-terrorism detention, involuntary hospitalization, immigration detention, detention for extradition and wholly groundless arrests. It also applies to detention for vagrancy or drug addiction, detention for educational purposes of children in conflict with the law and other forms of administrative detention. Detention within the meaning of paragraph 4 also includes house arrest and solitary confinement. When a prisoner is serving the minimum duration of a prison sentence as decided by a court of law after a conviction, either as a sentence for a fixed period of time or as the fixed portion of a potentially longer sentence, paragraph 4 does not require subsequent review of the detention.

The object of the right is release (either unconditional or conditional) from ongoing unlawful detention; compensation for unlawful detention that has already ended is addressed in paragraph 5. Paragraph 4 requires that the reviewing court must have the power to order release from the unlawful detention. When a judicial order of release under paragraph 4 becomes operative (exécutoire), it must be complied with immediately, and continued detention would be arbitrary in violation of article 9, paragraph 1.

The right to bring proceedings applies in principle from the moment of arrest and any substantial waiting period before a detainee can bring a first challenge to detention is impermissible. In general, the detainee has the right to appear in person before the court, especially where such presence would serve the inquiry into the lawfulness of detention or where questions regarding ill-treatment of the detainee arise. The court must have the power to order the detainee brought before it, regardless of whether the detainee has asked to appear.

Unlawful detention includes detention that was lawful at its inception but has become unlawful because the individual has completed serving a sentence of imprisonment or the circumstances that justify the detention have changed. After a court has held that the circumstances justify the detention, an appropriate period of time may pass, depending on the nature of the relevant circumstances, before the individual is entitled to take proceedings again on similar grounds.

'Unlawful' detention includes both detention that violates domestic law and detention that is incompatible with the requirements of article 9, paragraph 1, or with any other relevant provision of the Covenant. While domestic legal systems may establish differing methods for ensuring court review of detention, paragraph 4 requires that there be a judicial remedy for any detention that is unlawful on one of those grounds. For example, the power of a family court to order release of a child from detention that is not in the child’s best interests may satisfy the requirements of paragraph 4 in relevant cases.

Paragraph 4 entitles the individual to take proceedings before 'a court,' which should ordinarily be a court within the judiciary. Exceptionally, for some forms of detention, legislation may provide for proceedings before a specialized tribunal, which must be established by law and must either be independent of the executive and legislative branches or enjoy judicial independence in deciding legal matters in proceedings that are judicial in nature.

Paragraph 4 leaves the option of taking proceedings to the persons being detained or those acting on their behalf; unlike paragraph 3, it does not require automatic initiation of review by the authorities detaining an individual. Laws that exclude a particular category of detainees from the review required by paragraph 4 violate the Covenant. Practices that render such review effectively unavailable to an individual, including incommunicado detention, also amount to a violation. To facilitate effective review, detainees should be afforded prompt and regular access to counsel. Detainees should be informed, in a language they understand, of their right to take proceedings for a decision on the lawfulness of their detention.

Persons deprived of liberty are entitled not merely to take proceedings, but to receive a decision, and without delay. The refusal by a competent court to take a decision on a petition for the release of a detained person violates paragraph 4. The adjudication of the case should take place as expeditiously as possible. Delays attributable to the petitioner do not count as judicial delay.

The Covenant does not require that a court decision upholding the lawfulness of detention be subject to appeal. If a State party does provide for appeal or further instances, the delay may reflect the changing nature of the proceeding and in any event must not be excessive.

Article 37(b) of the Convention of the Rights of the Child establishes the general principle that a child may be deprived of liberty only as a last resort and for the shortest appropriate period of time. However, offences concerning irregular entry or stay cannot under any circumstances have consequences similar to those derived from the commission of a crime. Therefore, the possibility of detaining children as a measure of last resort, which may apply in other contexts such as juvenile criminal justice, is not applicable in immigration proceedings as it would conflict with the principle of the best interests of the child and the right to development.