(a) Have the necessary powers and resources to conduct the investigation effectively, including access to the documentation and other information relevant to their investigation; (b) Have access, if necessary with the prior authorization of a judicial authority, which shall rule promptly on the matter, to any place of detention or any other place where there are reasonable grounds to believe that the disappeared person may be present. 4. Each State Party shall take the necessary measures to prevent and sanction acts that hinder the conduct of an investigation. It shall ensure in particular that persons suspected of having committed an offence of enforced disappearance are not in a position to influence the progress of an investigation by means of pressure or acts of intimidation or reprisal aimed at the complainant, witnesses, relatives of the disappeared person or their defence counsel, or at persons participating in the investigation. Article 13 1. For the purposes of extradition between States Parties, the offence of enforced disappearance shall not be regarded as a political offence or as an offence connected with a political offence or as an offence inspired by political motives. Accordingly, a request for extradition based on such an offence may not be refused on these grounds alone. 2. The offence of enforced disappearance shall be deemed to be included as an extraditable offence in any extradition treaty existing between States Parties before the entry into force of this Convention. 3. States Parties undertake to include the offence of enforced disappearance as an extraditable offence in any extradition treaty subsequently to be concluded between them. 4. If a State Party which makes extradition conditional on the existence of a treaty receives a request for extradition from another State Party with which it has no extradition treaty, it may consider this Convention as the necessary legal basis for extradition in respect of the offence of enforced disappearance. 5. States Parties which do not make extradition conditional on the existence of a treaty shall recognize the offence of enforced disappearance as an extraditable offence between themselves. 6. Extradition shall, in all cases, be subject to the conditions provided for by the law of the requested State Party or by applicable extradition treaties, including, in particular, conditions relating to the minimum penalty requirement for extradition and the grounds upon which the requested State Party may refuse extradition or make it subject to certain conditions. 7. Nothing in this Convention shall be interpreted as imposing an obligation to extradite if the requested State Party has substantial grounds for believing that the request has been made for the purpose of prosecuting or punishing a person on account of that person’s sex, race, religion, nationality, ethnic origin, political opinions or membership of a particular social group, or that compliance with the request would cause harm to that person for any one of these reasons. Article 14 1. States Parties shall afford one another the greatest measure of mutual legal assistance in connection with criminal proceedings brought in respect of an offence of enforced disappearance, including the supply of all evidence at their disposal that is necessary for the proceedings. 2. Such mutual legal assistance shall be subject to the conditions provided for by the domestic law of the requested State Party or by applicable treaties on mutual legal assistance, including, in particular, the conditions in relation to the grounds upon which the requested State Party may refuse to grant mutual legal assistance or may make it subject to conditions. Article 15 5