The "bulletin" is the "Bulletin n° 3 du casier judiciaire". It is the printout of a criminal record issued to people by the central criminal records office. It is often requested by adoption agencies, for example, to prove that applicants do not have a criminal record (in which case the document bears an oblique line, indicating that there have been no convictions).
The rest of your sentence would be "under the terms of Article... of the Code of Criminal Proceedings (Code de Procédure Pénale)". I used to translate the French term for better understanding but include it in brackets in italics.