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Article D4 of the French Code of Criminal Procedure

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.

Original in French 🇫🇷
Article D4

Le magistrat fait appel aux officiers de police judiciaire relevant de la direction nationale de la police judiciaire ou de la direction nationale de la police aux frontières ou de la sous-direction de la police judiciaire de la direction générale de la gendarmerie nationale dans les cas de nécessité, en tenant compte des possibilités que procurent à l’officier de police judiciaire premier saisi sa rapidité d’intervention, ses sources d’information, sa connaissance de l’affaire et du milieu humain.

Le concours de ces officiers de police judiciaire peut se révéler indispensable lorsque la poursuite de l’enquête exige :

-soit une compétence technique particulière notamment dans les domaines relevant des offices centraux de police judiciaire énumérés à l’article D. 8-1 ; ces derniers assurent en outre, chaque fois que nécessaire, la coordination entre les services de police et les unités de gendarmerie ;

-soit des investigations internationales auprès d’offices ou d’organismes étrangers.

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