If I'm not mistaken, only the French (investigating magistrate) may decide to make their reports public.
He'd better refer to his minister before opening his mouth on this one!
(For anyone unfamiliar with French Law, criminal investigations are headed by a magistrate. The idea is that, not being a police officer, s/he can evaluate evidence more objectively, thereby better protecting the suspect's rights. It also means that when the case reaches the prosecutor, the evidence and charges are neatly packaged and ready to serve in court. In the USA, police officers run the investigation independently and then move it directly to the prosecutor who sometimes grumbles when officers don't think in legalese.)