Article D147 of the French Code of Criminal Procedure
Any detained person, within the meaning of article D. 50, may, exceptionally and for a specified time, be authorised to leave under escort, in accordance with the provisions of Article 148-5 or Article 723-6. When the person is in pre-trial detention, this authorisation is issued, in all matters and at all stages of the investigative procedure, by the investigating judge. When the case is referred to the trial court, this…