Montana Title 1. General Laws and Definitions § 1-5-617. Stamping device

(2)(a) On resignation from or the revocation or expiration of the notary public's commission or on the expiration of the date set forth in the stamping device, the notary public shall disable the stamping device by destroying, defacing, damaging, erasing, or securing the stamping device against use in a manner that renders the stamping device unusable.

(b) On the death or adjudication of incompetency of a notary public, the notary public's personal representative or guardian or any other person knowingly in possession of the stamping device shall render the stamping device unusable by destroying, defacing, damaging, erasing, or securing the stamping device against use in a manner that renders the stamping device unusable.