Article D47-1-7 of the French Code of Criminal Procedure
For the application of articles 694-25 and 694-26, the practical arrangements for the temporary transfer or transit of a person, including, where appropriate, details of the conditions of detention in the issuing or executing State, and the time limits by which he or she is to be transferred from and returned to the territory of the executing State shall be determined by mutual agreement between the issuing State and the…