Artikel 13

1. On written request, officials designated by the requesting administration may, subject to the requirements of the law of the requested State and with the authorisation 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 State and relevant to the requesting administration.
2. When officials of the requesting administration are present in the territory of the requested State 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.
3. They shall, while there, enjoy such protection from the requested State as is available under its national law, and be responsible for any offence they might commit.