Ohio Revised Code Title XIII. Commercial Transactions § 1345.10

(A) With the exception of consent judgments entered before any testimony is taken, a final judgment against a supplier under section 1345.07 of the Revised Code is admissible as prima-facie evidence of the facts on which it is based in subsequent proceedings under section 1345.09 of the Revised Code against the same supplier, or his successors or assigns.

(B) An action by or on behalf of a consumer pursuant to section 1345.09 of the Revised Code precludes that consumer from being included in a later class action by the attorney general with respect to the same transaction, but intervention by the attorney general in a pending action is authorized. If the attorney general brings a class action on behalf of consumers, a consumer may withdraw from the class action prior to trial, or, with the permission of the court, at any time.

(C) An action under sections 1345.01 to 1345.13 of the Revised Code may not be brought more than two years after the occurrence of the violation which is the subject of suit, or more than one year after the termination of proceedings by the attorney general with respect to the violation, whichever is later. However, an action under sections 1345.01 to 1345.13 of the Revised Code arising out of the same consumer transaction can be used as a counterclaim whenever a supplier sues a consumer on an obligation arising from the consumer transaction.