French Code of Criminal Procedure
In forceWhere there are one or more plausible reasons to suspect that, following his imprisonment, a convicted person has not complied with the prohibition imposed on him, pursuant to his sentence, from entering into contact with certain persons or certain categories of persons, to associate with certain convicted persons or to appear in a specially designated place, category of place or area, the police and gendarmerie units may, on the instructions of the sentence enforcement judge or, if the second paragraph of article 131-9 or the second paragraph of article 131-11 of the Penal Code, the sentence enforcement judge, referred to for this purpose by the public prosecutor, proceed, throughout the national territory, if these measures are essential to provide evidence of the violation of the prohibitions resulting from the conviction :
1° For a crime or offence mentioned in the first paragraph of Article 100 of this Code, to the interception, recording and transcription of correspondence transmitted by telecommunications, in accordance with the procedures laid down in Subsection 2 of Section 3 of Chapter I of Title III of Book I;
2° For a crime or offence mentioned in 1° of Article 230-32, to the real-time location of a person, without their knowledge, a vehicle or any other object, without the consent of its owner or possessor, in accordance with the procedures set out in Chapter V of Title IV of Book I.
