Article 78-2-2 of the French Code of Criminal Procedure
I.-At the written request of the public prosecutor, in the places and for the period of time that this magistrate determines and which may not exceed twenty-four hours, renewable by express decision and with reasons in accordance with the same procedure, officers of the judicial police and, on their orders and under their responsibility, the judicial police officers and deputy judicial police officers mentioned in 1°, 1° bis and 1°…