Where the provisions of the fourth paragraph of article 99-2 is applied to narcotic substances seized in the course of the proceedings, the investigating judge must retain a sample of these products in order to allow them to be examined, if necessary. This sample is placed under seal.
The seized substances must be weighed by the investigating judge or by a judicial police officer acting on a rogatory commission before they are destroyed. This weighing must be carried out in the presence of the person holding the substances or, failing that, in the presence of two witnesses requested by the investigating judge or judicial police officer and chosen from persons other than those under their authority. The weighing may also be carried out, under the same conditions, during the flagrante delicto or preliminary investigation, by a judicial police officer, or, during the customs investigation, by a category A or B customs officer.
The record of the weighing operations is signed by the above-mentioned persons. In the event of refusal, this is noted in the record.