MO HB160

Adds liability immunity for co-employees when their negligence in failing to maintain workplace safety causes injury or death to another employee, unless the co-employee engaged in purposeful, affirmatively dangerous conduct.

Maintains existing workers' compensation provisions including employer liability for workplace accidents irrespective of negligence, with exceptions for intentional self-inflicted injury and certain employee misconduct.

Reduces or forfeits compensation benefits when injuries result from employee failure to use safety devices, violation of workplace safety rules, drug or alcohol use, or participation in recreational activities.

Establishes that mental injury from work-related stress does not qualify for workers' compensation unless stress is extraordinary and unusual, and excludes injuries resulting from disciplinary action, evaluation, transfer, layoff, demotion, or termination taken in good faith.

Preserves firefighters' existing rights to receive psychological stress benefits and requires administrative law judges to weigh evidence impartially without favoring any party.