Maryland Code, State Government § 18-218

(2) 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, if any, the notary public shall disable the stamping device by destroying, defacing, damaging, erasing, or securing it against use in a manner that renders it unusable.

(3) 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 disable the stamping device by destroying, defacing, damaging, erasing, or securing it against use in a manner that renders it unusable.