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Under current Utah law, workers' compensation benefits can be reduced or eliminated when an employee's own misconduct — such as being intoxicated by alcohol or using unprescribed controlled substances — contributed to their workplace injury. This bill adds THC (the intoxicating compound in cannabis) and chemically similar substances to that same framework, establishing that if a blood test shows a THC concentration above 20 nanograms per milliliter at the time of injury, it is presumed that the employee's impairment was a major contributing cause of the injury. That presumption can be rebutted with evidence such as a doctor's opinion, proof the employee was not actually impaired, or a showing that the THC level could be consistent with passive (secondhand) exposure. The bill also requires that cannabinoid testing under this section use a blood test rather than a urine test, and it excludes several non-intoxicating cannabis compounds like CBD from the definition of THC analogs.