Article 18 2.

The persons referred to in Article 17 shall be subject to investigations launched on the basis of a decision of the Authority. When a person obstructs the conduct of the investigation, the financial supervisor of the Member State where the relevant premises are located shall provide, in compliance with national law, the necessary assistance, including facilitating the access by the Authority to the business premises of the natural and legal persons referred to in Article 17, so that the powers listed in paragraph 1 of this Article can be exercised.