Chapter 7. Ignition Interlock Device Program Ignition Interlock Device (IID) Program Changes continued Requirements for Multiple Offenders IID Program requirements will remain the same for multiple offender, though some defined infractions and violations have been amended in 540 CMR 25. License restriction codes remain the same. Revised Documentation All Interlock Program materials, Interlock Affidavits, and RMV hardship criteria (including OUI 24D, OUI Multiple Offense, Habitual Traffic Offender (HTO) and 94C (Drug Trafficking have been updated and are available online beginning July 1st. 07/21https://www.mass.gov/guides/ignition-interlock-device-program