Judicial police officers have jurisdiction within the territorial limits where they carry out their usual duties.
Officers of the judicial police, temporarily placed at the disposal of a service other than that to which they are assigned, have the same territorial jurisdiction as that of the officers of the judicial police of the host service.
Officers of the judicial police may travel throughout France to pursue their investigations and to conduct hearings, searches and seizures, after informing the public prosecutor in charge of the investigation or the examining magistrate. They are required to be assisted by a judicial police officer with territorial jurisdiction if the magistrate so decides. The public prosecutor of the judicial court in whose jurisdiction the investigations are being carried out is also informed by the judicial police officer of the transport. However, it is not necessary to inform the magistrates mentioned in this paragraph when the transport takes place in a jurisdiction bordering that in which the officer carries out his duties, Paris and the departments of Hauts-de-Seine, Seine-Saint-Denis and Val-de-Marne being considered as a single department for this purpose.
With the agreement of the competent authorities of the State concerned, judicial police officers may, on the basis of an express letter rogatory issued by the investigating judge or at the request of the public prosecutor, conduct hearings on the territory of a foreign State.
Officers or agents of the judicial police who usually carry out their duties in vehicles used for the collective transport of passengers or in places intended for access to these means of transport are competent to operate throughout the defence zone of their department of assignment, under conditions determined by decree in the Conseil d’Etat. When the requisitions issued by the public prosecutor pursuant to article 78-7 expressly provide for it, these officers or agents of the judicial police are competent to use them throughout the journey of a passenger rail transport vehicle.