A valid prescription does not automatically prevent a DUI charge because Mississippi law focuses on impairment rather than the legality of the medication. Lawful use of prescribed medication can still lead to charges if the medication adversely affects driving ability. Courts and prosecutors will consider whether the medication’s effects caused observable impairment, and whether officers followed proper procedures during the stop and testing. It is important to document prescriptions and medical context to show lawful use and to explain how medication timing and dosage align with observed behavior. In defense, medical records and expert analysis often play an important role in explaining that the presence of a medication does not equate to impairment. Counsel can obtain pharmacy records and physician notes to show dosing instructions and legitimate medical need. This evidence may help negotiate reduced charges or support defenses that challenge causation. For anyone in Hernando facing such a charge, early preservation of records and timely legal consultation improves the prospects of presenting a compelling medical explanation to prosecutors or the court.