; and (B) upon intervening, be heard on all matters arising in such civil action and file petitions for appeal of a decision in such action. (4) Investigatory powers Nothing in this subsection may be construed to prevent the attorney general of a State from exercising the powers conferred on the attorney general by the laws of the State to conduct investigations, to administer oaths or affirmations, or to compel the attendance of witnesses or the production of documentary or other evidence. (5) Preemptive action by the Commission If the Commission institutes a civil action or an administrative action for a violation of this section, the attorney general of a State may not, during the pendency of such action, bring a civil action under this subsection against any defendant named in the complaint of the Commission for the violation with respect to which the Commission instituted such action. (6) Actions by other state officials (A) In general In addition to any civil action brought by an attorney general under paragraph (1), any other consumer protection officer of a State who is authorized by the State to do so may bring a civil action under paragraph (1), subject to the same requirements and limitations that apply under this subsection to civil actions brought by an attorney general. (B) Savings provision Nothing in this subsection may be construed to prohibit an authorized official of a State from initiating or continuing any proceeding in a court of the State for a violation of any civil or criminal law of the State. (d) Rules of construction (1) Substantially similar products For purposes of this section, two consumer products are substantially similar if there are no substantial differences in the materials used in the product, the intended use of the product, and the functional design and features of the product. A difference in coloring among any consumer products shall not be construed as a substantial difference for purposes of this paragraph. (2) Substantially similar services For purposes of this