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Utah's workers' compensation law currently reduces or eliminates benefits when an employee's own misconduct—such as alcohol intoxication or unprescribed drug use—contributes to a workplace injury. This bill would add THC and chemically similar "THC analog" substances to that same framework, so that a whole blood THC concentration above 20 nanograms per milliliter at the time of injury would create a presumption that impairment was a major contributing cause of the injury, potentially reducing or eliminating benefits. That presumption could be rebutted with evidence such as a doctor's opinion that the THC level doesn't support a finding of impairment, proof the employee wasn't actually impaired, or a showing that the level is low enough to be consistent with secondhand exposure. The bill also requires that any cannabinoid testing done under this law use a blood test rather than a urine test, and it excludes several non-intoxicating cannabis compounds, such as CBD, from the definition of "THC analog."