Article D32-4 of the French Code of Criminal Procedure
When an application for placement under house arrest with electronic surveillance is referred to him or when he is considering imposing such a measure, the investigating judge or the liberty and custody judge or, in the event of an appeal, the president of the investigating chamber may instruct the prison integration and probation service: 1° To ensure the availability of the technical device described in l’article R. 57-11 ou R….