205 ILCS 605/2

For all consumer-deposit accounts opened after January 1, 1982, all new checks, drafts, or orders drawn on financial institution accounts shall clearly display on the face of each check, draft, or order a number. Each check, draft, or similar order shall be numbered consecutively. This Section shall not apply to temporary checks, drafts, or orders of withdrawal provided by financial institutions upon the opening of a consumer deposit account. No liability or penalty shall be imposed on any financial institution or printer for an unintentional failure to comply with this Act.