Controlled substance; Evidence suppression; Reasonable articulable suspicion; Issue preservation; Unreasonable searches and seizures; Traffic stop; Totality of the circumstances; Innocent conduct; Double jeopardy; Waiver; Motion to dismiss; Substantial evidence; Sufficiency of evidence; Reasonable inference; N.C. Gen. Stat. § 90-95; N.C. Gen. Stat. § 90-87; Methamphetamine possession; Cocaine possession; Cocaine delivery; Circumstantial evidence; Knowingly possessed; Expert testimony; Plain error; Probable impact; Reliable principles and methods; Reliability test; Rule 702; Chemical analysis; Speculation.