Article 22 The States Parties shall adopt the measures needed to ensure that no costs are charged for proceedings to secure the return of the minor, in accordance with their laws and shall advise persons legitimately interested in the return of the minor of the public defender services, benefits to the needy and other forms of free legal aid to which they may be entitled under the laws and regulations of the respective States Parties. CHAPTER IV Final Clauses Article 23 Each State Party may, at the time of signature, ratification, or accession to the present Convention or at any time thereafter, declare that it will recognize and execute criminal judgments handed down in other States Parties in respect of awards of damages resulting from the international traffic in minors. Article 24 In the case of a State which has two or more systems of law applicable in different territorial units with respect to matters covered by the Convention, any reference to: a) the law of the State shall be construed as referring to the law in the territorial unit in question; b) habitual residence in that State shall be construed as referring to habitual residence in a territorial unit of that State; c) the competent authorities of that State shall be construed as referring to those authorized to act in the relevant territorial unit. Article 25 If a State has two or more territorial units in which different systems of law apply in relation to the matters dealt with in this Convention, it may, at the time of signature, ratification or accession, declare that this Convention shall extend to all its territorial units or to only one or more of them. Such declaration may be modified by subsequent declarations, which shall expressly indicate the territorial unit or units to which the Convention applies. Such subsequent declarations shall be transmitted to the General Secretariat of the Organization of American States, and shall become effective ninety days after the date of their receipt. Article 26 Each State Party may, at the time of signature, ratification or accession to the present Convention or at any time thereafter, declare that it will not entertain in any civil suit a challenge to the existence of the facts of the crime or the guilt of the person convicted when a conviction has been handed down for this crime in another State Party. Article 27 The competent authorities in border areas of the States Parties may, at any time, directly agree on more expeditious procedures to locate and return minors than those provided for in the present Convention and