Article 8
If the findings of a roadside check on a vehicle registered in another Member State give grounds for believing that serious or repeated infringements have been committed which cannot be detected in the course of that check in the absence of the necessary data, the competent authorities of the Member States concerned shall assist one another in order to clarify the situation. Where, to that end, the competent Member State carries out a check in the undertaking, the other Member States concerned shall be notified of the results.