General requirements
Article 156
1. The applicant Member State shall ensure that all requests for assistance contain sufficient information to enable a requested Member State to fulfil the request, including any necessary evidence obtainable in the territory of the applicant Member State. 2. Requests for assistance shall be limited to substantiated cases where there is reasonable cause to believe that non-compliance with rules of the Common Fisheries Policy, in particular serious infringements referred to in Article 90(1) of the Control Regulation have occurred and where the applicant Member State is not able to obtain the requested information or to take the requested measures by its own means.