If I could change one thing about the way drug tests are conducted, it would be to Look for ways to determine the level of impairment instead of searching for usage in the past. In standard drug testing procedures, individuals are usually under the influence of drugs long after they have an effect. This is especially true for cannabis as it stays in the body for many days or even weeks, which has fewer implications in the current demand of the person. Baselines that reflect performance in real-time might be more useful than looking at indices or variables that reflect performance immediately post-task completion, for instance, cognitive or reflex-based tests whose goal is to assess the current state of a person. This would improve the process as the emphasis would be on providing a safe working environment rather than on punishing people for using legal substances that are off duty.