The defendant in an action for writing or for publishing a libel may introduce in evidence the truth of the matter contained in the publication charged as libellous; and the truth shall be a justification unless actual malice is proved.
Mass. Gen. Laws ch. 231, § 92
Truth as justification for libel
Official source: Massachusetts Legislature. Reproduced from public-domain Massachusetts statutes; confirm against the official source for the current text. Not legal advice.