When the estimated amount of his costs and fees exceeds 460 euros, the appointed expert must, before commencing his work, inform the court that commissioned him.
Except in emergencies, this estimate is communicated to the public prosecutor, who submits his observations within five days, after having had any necessary verifications carried out on the elements of the estimate presented by the expert.
If its observations are not taken into account, the public prosecutor may refer the matter, via the public prosecutor, to the president of the investigating chamber, who shall rule within eight days in a decision that may not be appealed.