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Question:

After your license is reinstated, you must keep an ignition interlock device (IID) installed in each vehicle that you operate for at least

A
Explaination

After your license is reinstated, you must keep an IID installed in each vehicle that you operate for at least six months. The IID measures your Breath Alcohol Concentration (BrAC) and won't let you start your vehicle if your BrAC exceeds your state's limit. [Ignition Interlock, Chapter 10 – Be in Shape to Drive, Missouri Department of Revenue Driver Guide]