Article 13
Investigations by the authorities of the Member States 1. At the request of the Commission, the competent authorities of the Member States shall undertake the investigations which the Commission considers to be necessary under Article 14 (1), or which it has ordered by decision pursuant to Article 14 (3). The officials of the competent authorities of the Member States responsible for conducting these investigations shall exercise their powers upon production of an authorisation in writing issued by the competent authority of the Member State in whose territory the investigation is to be made. Such authorisation shall specify the subject matter and purpose of the investigation. 2. If so requested by the Commission or by the competent authority of the Member State in whose territory the investigation is to be made, the officials of the Commission may assist the officials of such authorities in carrying out their duties.