Article 696-9-1 of the French Code of Criminal Procedure
For the search for a person who is the subject of a request for extradition or provisional arrest for the purposes of extradition, Articles 74-2 and 230-33 are applicable. The powers of the public prosecutor and the liberty and custody judge provided for by this article are exercised respectively by the public prosecutor and the president of the investigating chamber or the councillor appointed by him or her.