Artikel 13

1. On written request, officials designated by the requesting administration may, with the authorization of the requested administration and subject to conditions the latter may impose, for the purpose of investigating a customs offence:
a) consult in the offices of the requested administration the documents, registers and other relevant data to extract any information in respect of that customs offence;
b) take copies of the documents, registers and other data relevant in respect of that customs offence;
c) be present during an inquiry conducted by the requested administration in the customs territory of the requested Contracting Party and relevant to the requesting administration.
2. Officials of the requesting administration present in the territory of the requested Contracting Party pursuant to paragraph 1 of this Article shall act in an advisory capacity only and shall under no circumstances take part in any investigation or meet with people being questioned.
3. When officials of the requesting administration are present in the territory of the requested Contracting Party in the circumstances provided for in Article 10 or in paragraph 1 of this Article, they must at all times be able to furnish proof of their official capacity.
4. They shall, while there, enjoy the same protection as that accorded to customs officials of the other Contracting Party, in accordance with the laws in force there, and be responsible for any offence they might commit.