Can Someone Else Drive Your Car With an Ignition Interlock?

Yes, Others Can Drive It - With Rules

Florida doesn't restrict your IID-equipped vehicle to you alone. Family members, friends, and mechanics can legally drive it - as long as they use the device correctly. Every driver must provide a breath sample to start the car and complete every rolling retest, exactly like you would.

The catch: every test goes into your data log. When your spouse fails a rolling retest or a mechanic's helper can't figure out the handset, it's your record with the FLHSMV that takes the hit.

The Golden Rule: Never Blow for Anyone

The one rule with criminal exposure: you must never provide a breath sample so someone else can drive, and no one should blow to start the car for you either. Circumvention attempts are reported as tampering and can carry new charges - for both people.

Anyone who drives your car needs to be sober and needs to know the device. The 5-minute walkthrough matters.

Common Scenarios

• Spouse or family member - fine, if they test every time. Show them how the rolling retest works before they're on the highway.
• Mechanics and body shops - tell the shop ahead of time; most Florida shops have seen IIDs. Many providers offer a service/valet mode for repairs - ask your provider before the visit.
• Valet parking - legal, but awkward; the valet must blow. Many drivers just self-park.
• Teen drivers - same rules as anyone else, plus your own judgment about the risk to your log.

Protecting Your Record

If others will drive your car regularly:

1. Train them once, properly - five minutes at the kitchen table with the handset instructions
2. Keep a simple log - note dates/times someone else drove; if a weird event shows up in your data, context helps when you talk to your provider
3. Use service mode for repairs - it prevents false tampering flags during battery work
4. When in doubt, they don't drive - your requirement, your record, your timeline to removal

What About Other Cars?

The mirror-image question: while you're IID-required, you may only drive IID-equipped vehicles. Driving a friend's or rental car without a device is a violation even though their car is legal for them. Florida makes limited exceptions for employer-owned vehicles driven strictly for work duties with written employer notice - ask the FLHSMV or your attorney before relying on it.