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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
    • Ignition Interlock Device Cost
    • Why RoadGuard Interlock?
    • About Us
    • Find a Location Near You
  • Existing Customers
    • Contact Customer Support
    • All Support Topics
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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 Happens if Your Vehicle Fails Interlock Installation?

Interlock installation failed? Here’s why vehicles get rejected, what gets reported to the state, and how to get back on the road quickly.

What Causes Interlock Device False Readings

IID false readings happen even when you haven’t been drinking. Here’s the science of what triggers them and what to do when the device fails you.

Traveling Internationally While on an Interlock Program

Traveling internationally with interlock device questions answered: program rules, what to bring, calibration scheduling, and country-specific notes.

Transferring Your Interlock to a New Car: The Complete Guide

Transfer interlock device guide: how to move your IID to a new car, what paperwork to file with provider and state, and how to avoid a violation.

Reading Your Interlock Compliance Report: What Your PO Sees

Interlock compliance report explained: what your probation officer sees, what gets flagged, and how to actually read your monthly device log.

How to Legally Challenge a False Positive Interlock Reading

False positive interlock breathalyzer reading? Here’s how to legally challenge it, what evidence helps, and the immediate steps to take.

Navigating Interlock Requirements with No Vehicle Ownership

Interlock device no car ownership requirements explained: how to comply when you don’t own a vehicle, employer-vehicle paths, and state alternatives.

Understanding IID Look-Back Periods for Repeat Offenders

IID DUI look-back period explained: how state lookback windows affect repeat-offender penalties and how long ago counts as a ‘prior’ DUI.

Employer Exemptions from Interlock Devices Explained

Employer exemption interlock device requirements: when work vehicles qualify, what your employer signs, and how to file the right paperwork.

Can You Drive for DoorDash or Amazon Flex with an Interlock?

DoorDash Amazon Flex interlock device questions answered: background checks, app policies, and whether gig work is possible while on an IID.

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