1. Each State Party shall take appropriate measures to encourage persons who participate or who have participated in the commission of an offence established in accordance with this Convention to supply information useful to competent authorities for investigative and evidentiary purposes and to provide factual, specific help to competent authorities that may contribute to depriving offenders of the proceeds of crime and to recovering such proceeds.

2. Each State Party shall consider providing for the possibility, in appropriate cases, of mitigating punishment of an accused person who provides substantial cooperation in the investigation or prosecution of an offence established in accordance with this Convention.

3. Each State Party shall consider providing for the possibility, in accordance with fundamental principles of its domestic law, of granting immunity from prosecution to a person who provides substantial cooperation in the investigation or prosecution of an offence established in accordance with this Convention.

4. Protection of such persons shall be, mutatis mutandis, as provided for in article 32 of this Convention.

5. Where a person referred to in paragraph 1 of this article located in one State Party can provide substantial cooperation to the competent authorities of another State Party, the States Parties concerned may consider entering into agreements or arrangements, in accordance with their domestic law, concerning the potential provision by the other State Party of the treatment set forth in paragraphs 2 and 3 of this article.