The magistrate shall call upon judicial police officers from the National Directorate of the Judicial Police or the National Directorate of the Border Police or the Sub-Directorate of the Judicial Police of the National Gendarmerie General Directorate in cases of necessity, taking into account the possibilities afforded to the judicial police officer first approached by his speed of intervention, his sources of information, his knowledge of the case and the human environment.
The assistance of these judicial police officers may prove indispensable when the continuation of the investigation requires:
-either special technical expertise, particularly in the areas covered by the central judicial police offices listed in article D. 8-1; the latter also ensure, whenever necessary, coordination between police services and gendarmerie units;
-or international investigations with foreign offices or bodies.