1. The competent authorities of the host Member State may ask the competent authorities of the Member State of establishment, in the event of justified doubts, to provide any information relevant to the legality of the service provider's establishment and good conduct, as well as the absence of any disciplinary or criminal sanctions of a professional nature. In the event that the competent authorities of the host Member State decide to check the service provider's professional qualifications, they may ask the competent authorities of the Member State of establishment for information about the service provider's training courses to the extent necessary to assess substantial differences likely to be harmful to public health or safety. The competent authorities of the Member State of establishment shall provide that information in accordance with Article 56. In the case of non-regulated professions in the home Member State, the assistance centres referred to in Article 57b may also provide such information.

2. The competent authorities shall ensure the exchange of all information necessary for complaints by a recipient of a service against a service provider to be correctly pursued. Recipients shall be informed of the outcome of the complaint.