Maryland Estates and Trusts Section 4-507

      (a)      Any document of gift which has been delivered to the donee may be revoked by:

            (1)      The execution and delivery to the donee or his agent of a revocation in writing, signed by the donor;

            (2)      An oral statement of revocation witnessed by two persons, and communicated to the donee or his agent;

            (3)      A statement during a terminal illness addressed to the attending physician and communicated to the donee, or his agent; or

            (4)      A card or other writing signed by the donor and carried on his person or in his effects, revoking the gift.

      (b)      Any document of gift which has not been delivered to the donee may be revoked in the manner set out in subsection (a) of this section, or by destruction, cancellation, or mutilation of the document.

      (c)      Any gift made by a will may be revoked in the manner set out in subsection (a) of this section, or in the manner provided for revocation or amendment of wills.

      (d)      A gift made by a donor designation on the driver's license or identification card of the donor may be revoked by giving written notice to the Motor Vehicle Administration in accordance with § 12-303 of the Transportation Article.