Any witness summoned to be heard during the execution of a letter rogatory is required to appear, take an oath and give evidence. Where there is no plausible reason to suspect that he has committed or attempted to commit an offence, he may be detained only for the time strictly necessary for his hearing.
If he fails to comply with this obligation, notice shall be given to the instructing magistrate who may compel him to appear by force of law. A witness who fails to appear is liable to the fine provided for in Article 434-15-1 of the Penal Code.
The obligation to take an oath and give evidence is not applicable to persons in police custody pursuant to the provisions of article 154.