corresponding provisions of that treaty shall apply unless the States Parties agree to apply paragraphs 9 to 29 of this article in lieu thereof. States Parties are strongly encouraged to apply these paragraphs if they facilitate cooperation. 8. States Parties shall not decline to render mutual legal assistance pursuant to this article on the ground of bank secrecy. 9. States Parties may decline to render mutual legal assistance pursuant to this article on the ground of absence of dual criminality. However, the requested State Party may, when it deems appropriate, provide assistance, to the extent it decides at its discretion, irrespective of whether the conduct would constitute an offence under the domestic law of the requested State Party. 10. A person who is being detained or is serving a sentence in the territory of one State Party whose presence in another State Party is requested for purposes of identification, testimony or otherwise providing assistance in obtaining evidence for investigations, prosecutions or judicial proceedings in relation to offences covered by this Convention may be transferred if the following conditions are met: (a) The person freely gives his or her informed consent; (b) The competent authorities of both States Parties agree, subject to such conditions as those States Parties may deem appropriate. 11. For the purposes of paragraph 10 of this article: (a) The State Party to which the person is transferred shall have the authority and obligation to keep the person transferred in custody, unless otherwise requested or authorized by the State Party from which the person was transferred; (b) The State Party to which the person is transferred shall without delay implement its obligation to return the person to the custody of the State Party from which the person was transferred as agreed beforehand, or as otherwise agreed, by the competent authorities of both States Parties; (c) The State Party to which the person is transferred shall not require the State Party from which the person was transferred to initiate extradition proceedings for the return of the person; (d) The person transferred shall receive credit for service of the sentence being served in the State from which he or she was transferred for time spent in the custody of the State Party to which he or she was transferred. 12. Unless the State Party from which a person is to be transferred in accordance with paragraphs 10 and 11 of this article so agrees, that person, 21