Article 36
Professional secrecy and regulatory cooperation between Member States
If the requested competent authority is not able to supply the required information without undue delay, it shall notify the requesting competent authority of the reasons therefor.
The competent authorities may refuse to act on a request for information where:
supplying information might adversely affect the sovereignty, security or public order of the requested Member State or breach national security rules; or
judicial proceedings have already been initiated in respect of the same actions and against the same persons before the authorities of the requested Member State; or
final judgment has already been passed in respect of the same actions and on the same persons by the competent authorities of the requested Member State.
Without prejudice to the obligations to which they are subject in judicial proceedings, competent authorities or European Supervisory Authorities which receive information pursuant to paragraph 1 may use it only for the exercise of their functions within the scope of this Directive or Regulation (EU) No 537/2014 and in the context of administrative or judicial proceedings specifically related to the exercise of those functions.
It may further request that some of its own personnel be allowed to accompany the personnel of the competent authority of that other Member State in the course of the investigation.
The investigation shall be subject throughout to the overall control of the Member State on whose territory it is conducted.
The competent authorities may refuse to act on a request for an investigation to be carried out as provided for in the first subparagraph, or on a request for its personnel to be accompanied by personnel of a competent authority of another Member State as provided for in the second subparagraph, where:
such an investigation might adversely affect the sovereignty, security or public order of the requested Member State or breach national security rules; or
judicial proceedings have already been initiated in respect of the same actions and against the same persons before the authorities of the requested Member State; or
final judgment has already been passed in respect of the same actions on such persons by the competent authorities of the requested Member State.