Maryland Code, Public Safety § 5-107

(i) submit to the Secretary an application on the form that the Secretary provides; and

(ii) pay to the Secretary an application fee of $50, payable to the Comptroller.

(i) is a citizen of the United States;

(ii) is at least 21 years old;

(iii) has never been convicted of a disqualifying crime;

(iv) has never been convicted of a violation classified as a common law crime and received a term of imprisonment of more than 2 years;

(v) is not a fugitive from justice;

(vi) is not a habitual drunkard;

(vii) is not addicted to a controlled dangerous substance or is not a habitual user; and

(viii) has never spent more than 30 consecutive days in a medical institution for treatment of a mental disorder, unless a physician's certificate issued within 30 days before the date of application is attached to the application, certifying that the applicant is capable of possessing a regulated firearm without undue danger to the applicant or to another.