The samples and examinations referred to in article R. 241-5 must, on pain of nullity, be taken under the following conditions:
1° The materials required to collect the substances mentioned in article R. 241-5 must be supplied by the laboratory responsible for carrying out the analysis;
2° Each sample referred to in Article R. 241-5 must be distributed by the approved veterinarian in sufficient quantities in two sealed containers bearing an identification label with a code number. The person or persons mentioned in 1° of article R. 241-4 are invited to attend the operations provided for in 2° of the same article.