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| Ignition Interlock mandatory for all offenders. * | |
| Ignition Interlock mandatory for all repeat offenders and all first-time offenders with high BAC. | |
| Ignition Interlock mandatory for some other set of offenders. | |
| Ignition Interlock allowed, but not mandatory. | |
| No ignition interlock law. | |
| * Illinois, Nebraska and Washington laws mandating ignition interlock for all first-time offenders take effect in 2009. Source: MADD | |