Chapter IV
Fundamental Rights
35. (1) Every person shall be entitled to his personal liberty and no person shall be deprived of such liberty save in the following cases and in accordance with a procedure permitted by law -
(a) in execution of the sentence or order of a court in respect of a criminal offence of which he has been found guilty ;
(b) by reason of his failure to comply with the order of a court or in order to secure the fulfilment of any obligation imposed upon him by law ;
(c) for the purpose of bringing him before a court in execution of the order of a court or upon reasonable suspicion of his having committed a criminal offence, or to such extent as may be reasonably necessary to prevent his committing a criminal offence ;
(d) in the case of a person who has not attained the age of eighteen years for the purpose of his education or welfare ;
(e) in the case of persons suffering from infectious or contagious disease, persons of unsound mind, persons addicted to drugs or alcohol or vagrants, for the purpose of their care or treatment or the protection of the community ; or
(f) for the purpose of preventing the unlawful entry of any person into Nigeria or of effecting the expulsion, extradition or other lawful removal from Nigeria of any person or the taking of proceedings relating thereto :
Provided that a person who is charged with an offence and who has been detained in lawful custody awaiting trial shall not continue to be kept in such detention for a period longer than the maximum period of imprisonment prescribed for the offence.
Fair trial standards
Rights during investigation - arbitrary arrest or detention and deprivation of liberty
EDIT.