Article L813-10 of the French Code governing the entry and residence of foreign nationals and the right of asylum
If the foreign national does not provide information enabling an assessment to be made of his/her right to move or reside, the verification operations may give rise, after informing the public prosecutor, to the taking of fingerprints or photographs in order to establish the person’s situation. Fingerprints and photographs are collected with a view to establishing the foreign national’s right to move or reside and may only be stored and…