Md. Code, Family Law § 9–401

(a) In this subtitle the following words have the meanings indicated.

(b) “Law enforcement agency” means a State, county, or municipal police department or agency, or a sheriff’s department.

(c) “Missing child” means a person who is:

(1) under the age of 18 years; and

(2) the subject of a missing persons report filed with a law enforcement agency in this State and whose whereabouts are unknown.