WHY IT MATTERS: If you are a medical cannabis patient who drives, understanding the specific timing and formulation of your medication is critical to both your legal safety and your actual ability to operate a vehicle without impairment. CLINICAL OVERVIEW: Research examining driving behaviors among medical cannabis patients raises important questions about how THC affects psychomotor function, reaction time, and judgment at various doses and time points after consumption. The relationship between measured THC levels and actual impairment is complex, as tolerance, route of administration, and individual pharmacokinetics all influence functional capacity behind the wheel.