Qualified employees may make arrests throughout the state only when dressed in official uniform and displaying the official badge authorized by the department. Authorized employees may not carry firearms unless officially attired.
Mont. Code Ann. § 61-12-203
Official attire required for making arrests and carrying firearms
En
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.