Md. Code Ann., Cts. & Jud. Proc. § 7-404
If the service of process by a private process server is accomplished, a judge of the District Court or a circuit court may impose costs for the service of process in an amount not to exceed the fees authorized for the service of process by a sheriff under § 7-402 of this subtitle.
Added by Acts 1992, c. 329, § 1, eff. Oct. 1, 1992.