Mont. Code Ann. § 27-16-406

For the purpose of justification, each of the bail shall attend before the judge or clerk at the time and place specified in the notice and may be examined on oath, on the part of the plaintiff, touching the bail's sufficiency, in a manner that the judge or clerk, in the judge's or clerk's discretion, may think proper. The examination must be reduced to writing and subscribed by the bail if required by the plaintiff.