A defendant is entitled to a directed verdict only where there is no conflict in the evidence and the evidence introduced at trial with all reasonable deductions and inferences therefrom demands a verdict of not guilty as the only legal finding possible. Keenan v. State, 168 Ga. App. 51, 52 ( 308 S.E.2d 26). "In order to show the chain of custody adequate to preserve the identity of fungible evidence, the State has the burden of proving with reasonable certainty that the evidence is the same as that seized and that there has been no tampering or substitution.

Harris v. State, 155 Ga. App. 530 (1) ( 271 S.E.2d 668). See also Keenan v. State, 168 Ga. App. 51 ( 308 S.E.2d 26). The evidence presented was sufficient to enable any rational trier of fact to find the defendant guilty of the offenses charged beyond a reasonable doubt.