Article 706-57 of the French Code of Criminal Procedure
Persons against whom there are no plausible grounds for suspecting that they have committed or attempted to commit an offence and who are likely to provide evidence relevant to the proceedings may, with the authorisation of the public prosecutor or investigating judge, declare the address of the police station or gendarmerie brigade as their domicile. If the person has been summoned because of his profession, the address declared may be…