In connection with a proceeding, the State Board or a hearing officer whom the State Board designates: may hold hearings; may administer oaths; and by deposition in the same manner as provided in civil cases in the State or otherwise, may take testimony. The State Board or its designee may issue a subpoena. The police department of Baltimore City or the sheriff of a county shall serve a subpoena issued under this subsection. If a person fails to comply with a subpoena issued under this subsection, on petition of the State Board, a circuit court may compel compliance with the subpoena. If the State Board concludes that conduct alleged to be a violation of this title may result in irreparable harm to a person, the State Board may sue to enforce a provision of this title by ex parte, interlocutory, or final injunction. The State Board shall bring suit under this subsection in the circuit court for the county where: the violation allegedly is occurring; or the principal place of business of the alleged violator is located. In seeking an injunction under this subsection, the State Board is not required to allege or prove that an adequate remedy at law does not exist.