accordance with its domestic law, to provide for sanctions in cases of violation of the obligation set forth in paragraph 3 of this article. 5. Each State Party shall consider taking measures that permit, in accordance with its domestic law, the denial of entry or revocation of visas of persons implicated in the commission of offences established in accordance with this Protocol. 6. Without prejudice to article 27 of the Convention, States Parties shall consider strengthening cooperation among border control agencies by, inter alia, establishing and maintaining direct channels of communication. Article 12 Security and control of documents Each State Party shall take such measures as may be necessary, within available means: (a) To ensure that travel or identity documents issued by it are of such quality that they cannot easily be misused and cannot readily be falsified or unlawfully altered, replicated or issued; and (b) To ensure the integrity and security of travel or identity documents issued by or on behalf of the State Party and to prevent their unlawful creation, issuance and use. Article 13 Legitimacy and validity of documents At the request of another State Party, a State Party shall, in accordance with its domestic law, verify within a reasonable time the legitimacy and validity of travel or identity documents issued or purported to have been issued in its name and suspected of being used for trafficking in persons. IV. Final provisions Article 14 Saving clause 1. Nothing in this Protocol shall affect the rights, obligations and responsibilities of States and individuals under international law, including international humanitarian law and international human rights law and, in particular, where applicable, the 1951 Convention and the 1967 Protocol relating to the Status of Refugees and the principle of non-refoulement as 49