Mont. Code Ann. § 13-27-408

The secretary of state shall reject, with the approval of the attorney general, an argument or other matter held to contain obscene, vulgar, profane, scandalous, libelous, or defamatory matter; any language that in any way incites, counsels, promotes, or advocates hatred, abuse, violence, or hostility toward, or that tends to cast ridicule or shame upon, a group of persons by reason of race, color, religion, or sex, as defined in 1-1-201; or any matter not allowed to be sent through the mail. Such arguments may not be filed or printed in the voter information pamphlet.