Under French law, the use of a technical device for real-time tracking is governed by articles 230-32 to 230-44 and article 709-1-3 2° of the Criminal code of procedure and article 67 bis-2 of the customs code.
Most of the time, tracking measures are limited to the implementation of a technical surveillance, disconnected from any physical surveillance. The location data is obtained in real time and processed immediately or afterwards by the investigators. The crossing of the border cannot always be predicted. The location data, which has taken place on the territory of another State, may only be used in proceedings after the issuing of a mutual legal assistance request, either when the requested State has previously or concomitantly given its consent, or when it has subsequently authorised their use.