Pursuant to Public Safety Article, §5-306(a), Annotated Code of Maryland, the Secretary shall issue handgun permits under specified conditions. Unless otherwise provided by law, a person shall have a valid permit in their possession to carry, wear, or transport a handgun. A valid permit must satisfy all the requirements set forth in this chapter, including any limitations or restrictions imposed by the Secretary. A permit holder may not wear, carry, or transport a handgun while under the influence of alcohol or drugs. Except as provided in §F of this regulation, all valid permits must be issued by the Secretary. An armored car driver’s permit from another state is valid if the driver is on duty in Maryland.