Article 3
Investigation and prosecution 1. Member States shall assist one another in investigating and prosecuting the crimes referred to in Article 1 in accordance with relevant international agreements and national law. 2. Where, in connection with the processing of an application for a residence permit, the immigration authorities become aware of facts which give rise to a suspicion that the applicant has participated in crimes referred to in Article 1, and where it emerges that the applicant has previously sought permission to reside in another Member State, the law enforcement authorities may apply to the competent law enforcement authorities in the latter Member State with a view to obtaining relevant information, including information from the immigration authorities. 3. Insofar as the law enforcement authorities in a Member State become aware that a person suspected of crimes as referred to in Article 1 is in another Member State, they shall inform the competent authorities in the latter Member State of their suspicions and the basis thereof. Such information shall be provided in accordance with relevant international agreements and national law.