The duties of investigation assistant may be performed by the staff mentioned in article 21-3 who have passed an examination certifying their suitability to carry out the duties provided for in that same article, after having received specific training relating to those duties, and who are assigned to a national police service or a national gendarmerie unit from among those mentioned in articles R. 15-18 à R. 15-25.
A joint order of the Minister of Justice and the Minister of the Interior sets the content and duration of the training programme and the examination tests as well as the procedures for organising them.