Article R1335-22 of the French Public Health Code
If the Prefect, on receipt of a referral from the Director General of the Regional Health Agency, considers that one of the requirements resulting from articles R. 1335-16 to R. 1335-20 has not been complied with, he shall give formal notice to the operator, by any means capable of giving a date certain to the notification of this formal notice, to take preventive or corrective measures within a specified period….