Human rights — Admissibility of author’s communication to Human Rights Committee — Reservation to Article 5(2)(a) of Optional Protocol to International Covenant on Civil and Political Rights, 1966 — When a case has been “examined” for the purpose of a reservation — Consideration of merits — Right to freedom from torture or cruel, inhuman and degrading treatment or punishment — Right of persons deprived of their liberty to be treated with humanity and respect for the inherent dignity of the person — Right to an effective remedy — Incommunicado detention — International Covenant on Civil and Political Rights, 1966, Articles 2, 7 and 10 — Effective remedy — United Nations Human Rights Committee