This subtitle establishes a code of fair procedures for the operation of an investigating committee so that it may hold hearings and otherwise properly carry out its powers and duties fairly, impartially, and consistently with: the constitutional rights of a person who is involved in a proceeding of the investigating committee; and the public good. This subtitle does not limit the acquisition of information or evidence by an investigating committee through a lawful means other than as provided in this subtitle. This subtitle does not limit the authority of a committee of the General Assembly or any subcommittee of a committee of the General Assembly to exercise the power to administer oaths and subpoena witnesses and records as otherwise authorized by law.