Article 706-80 of the French Code of Criminal Procedure
The judicial police officers and, under their authority, the judicial police agents, after informing the public prosecutor and unless this magistrate objects, may extend to the whole of the national territory the surveillance of persons against whom there are one or more plausible reasons to suspect them of having committed one of the crimes and offences falling within the scope of Articles 706-73,706-73-1or 706-74 or surveillance of the routing or…