Article R53-40-3 of the French Code of Criminal Procedure
If the liberty and custody judge does not grant the investigating judge’s request, this request, the liberty and custody judge’s decision, the public prosecutor’s opinion and, where applicable, the investigators’ report are placed in a file separate from the proceedings file, which is kept by the president of the judicial court or the judge delegated by him. This file, which may not be communicated within the framework of the proceedings…