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  • New Customers
    • RoadGuard’s Ignition Interlock Device
    • DUI Laws by State
    • What Is an Interlock?
    • Schedule Interlock Installation
    • State License Reinstatement
    • Ignition Interlock for Hearing Impaired or Deaf Drivers
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  • Locations
    • Alabama
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  • Existing Customers
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Discover the RoadGuard Interlock blog and learn about ignition interlock devices, DUI laws, and get safe driving and responsible drinking tips.

What Is Interlock Calibration? How It Works and What to Expect

Interlock calibration checks your device’s alcohol sensor against a known standard. See what happens at the visit, how scheduling works and how to prepare.

How Long Can a Breathalyzer Detect Alcohol?

A breathalyzer detects alcohol until your body clears it, often hours and sometimes into the next day. See what sets the timeline, including for 2 beers.

Interlock Test the Morning After Drinking: How Long Alcohol Stays on Your Breath

Alcohol stays on your breath until your body clears it, often into the next morning. See what an interlock measures and why only time lowers it.

Ignition Interlock Device Rolling Retest: How It Works and What to Do

A rolling retest is a breath test your ignition interlock asks for while the engine runs. See how the prompt works and what to do if you miss or fail one.

How to Get an Ignition Interlock Device Installed: Who Installs It and What to Expect

A trained technician at a state-approved service center installs your interlock. See how to book, what to bring and what happens at the appointment.

Can You Put an Interlock Device on a Motorcycle?

Yes, an interlock can go on a motorcycle where your state allows it. See what decides it and how the install appointment works for your bike.

Does Alcohol Tolerance Affect Your BAC? What a Breath Test Actually Measures

No. Alcohol tolerance changes how drunk you feel and look, but a breath test still measures the alcohol on your breath. Here’s what that means for an interlock.

What Is SATOP? How Missouri’s DWI Program Fits With Your Ignition Interlock

SATOP is Missouri’s Substance Awareness Traffic Offender Program. See who has to complete it, how screening and levels work, and where an interlock fits.

Taking Your Driving Test in a Car With an Ignition Interlock: What to Expect

In many places you can take your interlock driving test in your own interlock car. Confirm with the testing site, bring paperwork and plan for a retest.

How Long Does It Take for Alcohol to Kick In? Why Your BAC Can Keep Rising After Your Last Drink

Alcohol reaches your blood soon after you drink, yet BAC can keep rising after your last one. Here’s why that happens and what it means for a breath test.

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