Such order can only be made on the motion of a party, upon affidavit showing the nature of the action or proceeding, the testimony expected from the witness, and its materiality.
Mont. Code Ann. § 26-2-202
Motion and affidavit required
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.