Mont. Code Ann. § 50-78-401

The provision of information to an employee does not in any way affect the liability of an employer with regard to the health and safety of an employee or other person exposed to hazardous chemicals, nor does it affect the employer's responsibility to take any action to prevent the occurrence of occupational disease or accident as required under any other provision of law. The provision of information to an employee does not affect any other duty of a manufacturer, producer, or formulator to warn ultimate users of a hazardous chemical under any other provision of law.