Mont. Code Ann. § 23-5-138

When conducting an administrative proceeding under parts 1 through 8 of this chapter, the department may consider hearsay evidence approved by the hearing examiner in a prehearing conference at which a determination is made that the evidence possesses sufficient guaranties of trustworthiness and does not involve a question of the credibility of a witness or of the credibility of a witness's subjective observations or analysis.