The accused has seriously disputed the claim of PW.1 about the affixture of seal on the material objects as well as on the samples. PW.1 himself has admitted that the seal, which he claimed to have affixed on MO.1, is not seen on MO.1 at the time of his examination. In this case no forwarding note or requisition for sending the samples for chemical analysis is prepared and filed before the court. If a formal requisition or forwarding note is prepared and filed before the court, the same would have contained the sample seal, of the seal allegedly affixed by PW.1 on the sample bottle. The investigating officer has also deposed that he is not aware whether any specimen seal is produced before the court. So, absolutely there is no evidence to convince the court that the prosecution has proved that the sample seal or specimen impression of the seal, alleged to have been affixed in the sample by PW.1 has been provided to the chemical examiner for their verification and to ensure that the sample seal, so provided, is tallying with the seal affixed on the sample bottle. In spite of the above fact and in the absence of sample seal,