1. Suit by the state to assess a civil penalty or to obtain a criminal conviction under this chapter must be commenced within four years after the cause of action accrues or, if there is fraudulent concealment of this cause of action, within four years after the cause of action becomes known, whichever period is later.
2. Suit under section 553.12 must be commenced within four years after the cause of action accrues or, if there is a fraudulent concealment of this cause of action, within four years after the cause of action becomes known, whichever period is later. However, if this cause is based, in whole or part, on the same set of facts as alleged in a suit brought under section 553.13, this period shall be suspended until one year after the suit brought under section 553.13 is concluded.