Md. Code, Public Safety § 3–103

(a) An individual may file a complaint of police misconduct with the law enforcement agency that employs the police officer who is the subject of the complaint.

(b) (1) A complaint of police misconduct filed with a law enforcement agency shall include:

(i) the name of the police officer accused of misconduct;

(ii) a description of the facts on which the complaint is based; and

(iii) contact information of the complainant or a person filing on behalf of the complainant for investigative follow–up.

(2) A complaint need not be notarized.