Driving is an activity which requires sustained attention. Drivers must focus on driving and divide their attention among multiple parts of the driving activity: steering, acceleration, braking, watching the speedometer, watching the road, and reacting to a constantly changing environment. For DUI investigations (called ‘OVI’ in Ohio), law enforcement officers are taught to look for problems with attention and administer divided attention sobriety tests. What happens when the subject of an OVI investigation is a driver with ADHD?