Drug-impaired drivers are a hazard on the road, and have been a contributing cause of vehicle collisions and fatalities in America. Local police enforcement across the nation have been trying to fight this problem and crack down on DUI driving. Even in states like California, where recreational marijuana use has been legalized, the local governments have laws in place prohibiting individuals from the use of drugs before or during the operation of a vehicle. But how can this actually be detected or enforced? Though there are physical affects of marijuana use, these signs are not always reliable. We will explore this issue and the upcoming solutions to this societal issue.