Article 695-18 of the French Code of Criminal Procedure
When the public prosecutor who issued the European arrest warrant has obtained the surrender of the requested person, that person may not be prosecuted, sentenced or detained with a view to the enforcement of a custodial sentence for any act prior to the surrender and other than that which motivated that measure, except in one of the following cases: 1° Where the person has expressly renounced, at the same time…