Md. Code, Public Safety § 3–601

(a) (1) A law enforcement agency may not establish a mandatory waiting period before taking a missing person report.

(2) A law enforcement agency shall make every effort to inform the general public and the family of a missing person that the agency does not impose a mandatory waiting period before taking a missing person report.

(b) In accordance with subsection (a) of this section, a law enforcement agency:

(1) shall accept without delay a report of a missing person provided in person; and

(2) may accept a report of a missing person by phone or other electronic means if:

(i) that form of reporting is consistent with the policy of the law enforcement agency; and

(ii) the reporting person completes the report in person as soon as possible.

(c) With regard to a missing person as defined in § 3–604 of this subtitle, a law enforcement agency shall enter all necessary and available information into the National Crime Information Center computer network within 2 hours after receipt of the minimum information necessary to make the entry.