The technical device referred to in article 230-47 is authorised:
1° As part of a flagrante delicto investigation, a preliminary investigation or a procedure provided for in articles 74 to 74-2, by the public prosecutor, for a maximum period of one month, renewable once;
2° As part of an investigation or inquiry into the causes of death or the causes of disappearance mentioned in articles 74,74-1 and 80-4, by the investigating judge, for a maximum renewable period of four months, without the total duration of the operations exceeding two years.