Officier de Police Judiciaire" (OPJ) →
officer of judicial police[...]There are three judiciary qualifications: "
officer of judiciary police" (officier de police judiciaire or OPJ), "agent of judiciary police" (agent de police judiciaire or APJ) and "agent of judiciary police assistant" (APJ adjoint). The qualifications of OPJ and APJ can only be exercised if they are affected to a position where these are needed, and, for the OPJs by nominal decision of the general prosecutor of their area. These prerogatives are temporarily suspended when they engage, in an organized force, in an operation of public order (i.e. riot control).[...]
Law enforcement in France - Wikipedia, the free encyclopedia