Md. Code Ann., Est. & Trusts § 14.5-711

A judge of a court established under the laws of the State or the United States or a clerk of court or register of wills, unless the judge, clerk, or register is the surviving spouse of the grantor of the trust, or is related to the grantor within the third degree, may not serve as a trustee of an inter vivos or testamentary trust created by an instrument and executed in the State by the grantor or a trustee, administered in the State, or governed by the laws of the State, unless the judge, clerk, or register was actually serving as a trustee of the trust on December 31, 1969.