Montana Title 39. Labor § 39-2-904. Elements of wrongful discharge

(a) it was in retaliation for the employee's refusal to violate public policy or for reporting a violation of public policy;

(b) the discharge was not for good cause and the employee had completed the employer's probationary period of employment;

(c) the employer materially violated an express provision of its own written personnel policy prior to the discharge, and the violation deprived the employee of a fair and reasonable opportunity to remain in a position of employment with the employer; or

(d) the employer terminated the employee solely based on the employee's legal expression of free speech, including but not limited to statements made on social media.