Article R741-3 of the French Code governing the entry and residence of foreign nationals and the right of asylum
The matter shall be referred to the liberties and detention judge by the foreign national challenging the legality of the decision to place him or her in administrative detention by simple petition, under the conditions provided for in Chapter III, before the expiry of the period mentioned in article L. 741-10.The petition shall be sent by any means to the registry of the court with jurisdiction pursuant to article R….