(a) Any suit to recover damages under Section 15.21 of this Act is barred unless filed within four years after the cause of action accrued or within one year after the conclusion of any action brought by the state under Section 15.20 or 15.22 of this Act based in whole or in part on the same conduct, whichever is longer. For the purpose of this subsection, a cause of action for a continuing violation is considered to accrue at any and all times during the period of the violation.
(b) No suit under this Act shall be barred on the grounds that the activity or conduct complained of in any way affects or involves interstate or foreign commerce. It is the intent of the legislature to exercise its powers to the full extent consistent with the constitutions of the State of Texas and the United States.