12. Through review of successive reports from States parties, the examination of individual communications, and monitoring of developments, the Committee has, in its concluding observations, articulated its understanding of what constitute effective measures, highlights of which we set forth here. In terms of both the principles of general application of article 2 and developments that build upon specific articles of the Convention, the Committee has recommended specific actions designed to enhance each State party’s ability swiftly and effectively to implement measures necessary and appropriate to prevent acts of torture and ill-treatment and thereby assist States parties in bringing their law and practice into full compliance with the Convention. 13. Certain basic guarantees apply to all persons deprived of their liberty. Some of these are specified in the Convention, and the Committee consistently calls upon States parties to use them. The Committee’s recommendations concerning effective measures aim to clarify the current baseline and are not exhaustive. Such guarantees include, inter alia, maintaining an official register of detainees, the right of detainees to be informed of their rights, the right promptly to receive independent legal assistance, independent medical assistance, and to contact relatives, the need to establish impartial mechanisms for inspecting and visiting places of detention and confinement, and the availability to detainees and persons at risk of torture and ill-treatment of judicial and other remedies that will allow them to have their complaints promptly and impartially examined, to defend their rights, and to challenge the legality of their detention or treatment. 14. Experience since the Convention came into force has enhanced the Committee’s understanding of the scope and nature of the prohibition against torture, of the methodologies of torture, of the contexts and consequences in which it occurs, as well as of evolving effective measures to prevent it in different contexts. For example, the Committee has emphasized the importance of having same sex guards when privacy is involved. As new methods of prevention (e.g. videotaping all interrogations, utilizing investigative procedures such as the Istanbul Protocol of 1999260, or new approaches to public education or the protection of minors) are discovered, tested and found effective, article 2 provides authority to build upon the remaining articles and to expand the scope of measures required to prevent torture. 260. Manual on the Effective Investigation and Documentation of Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment. Effective investigation of ill-treatment – Guidelines ► Page 112