As many of you know, California recently legalized recreational cannabis for adults over 21 years old. Since the passage of the Compassionate Use Act of 1996, California has also allowed individuals to obtain cannabis for medical purposes. Legal cannabis also affects the workers’ compensation system in California. California employers are not liable if injury claims involve illicit drug or alcohol intoxication. However, there is a catch. Before an employer can deny a claim, they must show that there is a proximate cause between the workplace injury and drug or alcohol use. This is problematic because the active ingredient in cannabis (THC) is fat-soluble. You could test positive for cannabis several weeks after your last use. To make matters more confusing, a positive drug test does not necessarily mean you were intoxicated at the time of the accident. There are also no tests or benchmarks for measuring cannabis intoxication. Therefore, it is often very difficult to determine whether cannabis intoxication was the proximate cause of a workplace injury or accident.