contraband and the sample before the Court on 6-11-2002. PW1 did not state any reason for the delayed production of the contraband and the sample before the Court. There is also no evidence with regard to the safe custody of the contraband and the sample till their production before the Court. Since there was unexplained delay from 20-08-2002 to 6-11-2002 in producing the sample before the Court, there cannot be any guarantee that the sample produced before the Court and analysed in the Laboratory was the sample drawn from the contraband seized from the appellant, particularly when there is no evidence to prove the safe custody of the sample till its production before the Court. Therefore, there is no link evidence connecting the appellant with the sample analysed in the Laboratory. In the said circumstances, the conviction and sentence passed by the court below relying on Ext. P5 certificate of chemical analysis cannot be sustained.