A prescription drug DUI allegation claims a driver was operating a vehicle while their ability to drive was impaired by a legally prescribed medication. Mississippi law focuses on observable impairment rather than mere presence of a substance. Evidence may include officer observations, field sobriety test performance, and chemical testing that indicates medication presence. The critical inquiry is whether the medication produced functional impairment affecting safe driving, not solely whether a medication appears in a toxicology report. If you face such a charge in Sardis, it is important to preserve medical records and testing data early. Counsel will review the nature of the medication, dosage, timing, and any interactions with other substances to determine whether the evidence supports a claim of impairment or whether alternative explanations are possible.