People v. Clinton 

Chemist cannot combine packets of substance to reach a specific weight prior to testing for presence of controlled substance, for State to meet its burden of proof as to weight of controlled substance. Evidence insufficient to establish intent to deliver where Defendant possessed 13 tin foil packets of suspected heroin and $40, but Defendant did not possess weapons, cell phone, pager, or drug paraphernalia, and police did not observe transaction or receive tip of suspicious drug activity.