Florida Ignition Interlock Laws: Duration, Costs, and Removal

Florida ignition interlock laws require anyone convicted of DUI to install a breath-testing device on every vehicle they own or routinely drive before getting a license back, with installation periods running from six months for an aggravated first offense to five years or more for a fourth conviction. Whether the device is mandatory, and for how long, depends on your blood-alcohol level at the time of the arrest, how many prior DUIs you have, and whether a minor was in the car.

How Long the Device Stays on Your Car

Florida sets the rules in two places: Section 316.193 lays out DUI penalties, and Section 322.2715 governs what the Department of Highway Safety and Motor Vehicles requires before it reissues a license.

First Offense

A first DUI with a BAC of 0.08 to just under 0.15 gives the judge discretion to order an IID for at least six continuous months, but the court doesn’t have to.¹ Many first-time offenders in that range never receive the requirement.

If your BAC was 0.15 or higher, or a person under 18 was in the vehicle, the IID becomes mandatory for at least six continuous months.² A judge can extend that period but cannot waive it.

Second Offense

A second DUI carries a mandatory IID for at least one continuous year, whatever the BAC.² If that second offense involved a BAC of 0.15 or higher or a minor passenger, the minimum jumps to two continuous years.¹

Third and Subsequent Offenses

A third DUI requires an IID for at least two continuous years.¹ That two-year minimum applies whether the third conviction falls inside or outside the ten-year window that determines felony treatment.²

A fourth or subsequent conviction is a third-degree felony, and DHSMV requires an IID for at least five years as a condition of any hardship license.³

These minimums are floors. A judge can order a longer installation period based on the facts of the case, and often does when the BAC was very high or the offense involved a crash with injuries.

How the Device Works

The IID is a small breathalyzer wired into your ignition. Before the engine starts, you blow into it. If your breath-alcohol reading is above the set point, typically 0.020, the car will not start. After a brief lockout you get another try.

Monitoring continues while you drive. The device prompts you for rolling retests at random intervals, and you have up to three minutes to provide a breath sample. The IID won’t shut off a running engine, but if you skip a retest or fail one, the horn and lights will activate until you pull over.⁴

DHSMV counts any of the following as a violation: two startup tests above the set point, a missed rolling retest, a rolling retest reading above the set point, or evidence of tampering.⁴ When a violation is logged, you’ll get a letter from DHSMV. You have ten days from the date of that letter to contact a licensed DUI program in the county where you live, work, or attend school and schedule a review.

Installation and What It Costs

Installation must be done by a provider under contract with DHSMV. Approved vendors include LifeSafer, Intoxalock, Smart Start, and others. The device goes on every vehicle you individually or jointly own, lease, or routinely operate, not just one car.² Two cars, two devices.

Expect to bring the vehicle in every 30 to 60 days for a service appointment. A technician recalibrates the device, downloads the recorded data, and transmits it to DHSMV and your monitoring agency.

You pay for all of it. Monthly lease and monitoring fees in Florida generally run $100 to $140, plus a separate installation charge and often a removal fee. Prices vary by vendor, so it’s worth calling more than one before signing. Over a one-year mandatory period, plan on roughly $1,500 to $2,000 in device costs alone.

When You Can Drive Without the Device

Florida allows a narrow exemption for employer-owned vehicles. If your job requires you to drive a vehicle your employer owns, you can operate that vehicle without an IID installed, as long as the employer has been notified of your driving restriction and proof of that notification is kept in the vehicle. The exemption does not apply if the business that owns the vehicle is itself owned or controlled by you.⁵ Forming an LLC and titling your car to it will not work.

If you’re required to have an IID but don’t own a vehicle at all, DHSMV may reinstate your driving privileges without one installed. Your license will carry a permanent “P” restriction until you can comply with the IID requirement.⁵

A medical exemption exists for people who physically cannot blow into the device. The standard setting requires 1.5 liters of breath per sample; a physician can request a reduction to 1 liter, and a full waiver may be available if the person cannot meet even the reduced level.⁶ A waiver does not shorten the timeline. If you get one while seeking a restricted license, you cannot get that restricted license until the full IID period that would otherwise apply has expired. If you get one while seeking permanent reinstatement, you’ll be limited to an employment-purposes-only license and supervised by a licensed DUI program for the balance of the IID period.²

Tampering and Non-Compliance

Every IID installed in Florida carries a warning label stating that tampering with, circumventing, or misusing the device is a violation of law and can create civil liability.⁷ Under Florida’s penalty structure, a first-degree misdemeanor carries up to one year in jail and a fine of up to $1,000.⁸ Having someone else blow into the device for you falls within the same prohibited conduct.

The bigger risk is usually the probation side. Tampering or circumvention is a probation violation, which gives the judge authority to revoke your driving privileges entirely, extend the IID period, tighten probation conditions, or send you to jail on the underlying DUI sentence.

FR-44 Insurance

Florida requires anyone convicted of DUI to file an FR-44 certificate of financial responsibility. That means carrying liability coverage of $100,000 for bodily injury or death per person, $300,000 per crash, and $50,000 for property damage.⁹ Florida’s standard minimum bodily injury requirement is $10,000 per person, so the FR-44 numbers are roughly ten times higher.

You must keep the FR-44 in place for at least three years from the date your license is reinstated. Three years without another DUI or felony traffic offense clears the requirement.⁹ Premiums during those three years typically run two to three times what a clean-record driver pays, and the total insurance cost often exceeds what you’ll pay for the IID itself.

Commercial Driver’s License

A DUI conviction disqualifies you from operating any commercial motor vehicle for one year, even if the offense occurred in your personal car. If you were transporting hazardous materials at the time, the disqualification runs three years. A second qualifying offense results in permanent CDL disqualification.¹⁰ The employer-vehicle exemption does not override this. Even if your employer would let you drive the truck, you’re legally barred from commercial driving during the disqualification.

Ending the Installation and Removing the Device

Removal is not automatic when your period ends. You have to surrender your driver’s license at a DHSMV office or tax collector office, get proof of surrender, and bring that proof to your IID provider before they can take the device off.⁴

Timing matters. If the device comes off before the expiration date on your restriction, you may be required to restart the entire restriction from scratch with no credit for time already served.⁴ Confirm with DHSMV that your restriction has expired before you schedule removal. Your IID period starts running from the day the “P” restriction first appears on your license, not from the date of conviction or sentencing.³

Once the device is off and you’ve finished the other reinstatement steps, including the DUI education program, community service, fines, and FR-44 filing, you can apply for a license without the “P” restriction.

1
Justia Law. Florida Code 316.193 – Driving Under the Influence
2
Florida Senate. Florida Code 322.2715 – Ignition Interlock Device
3
Florida Highway Safety and Motor Vehicles. Ignition Interlock Program
4
Florida Highway Safety and Motor Vehicles. Ignition Interlock Device (IID) Frequently Asked Questions
5
Florida Highway Safety and Motor Vehicles. IID Required, Operating a Vehicle is Required by Employer, Client Does Not Own a Vehicle
6
Florida Highway Safety and Motor Vehicles. HSMV 77066 – Ignition Interlock Medical Evaluation Form
7
Florida Senate. Florida Code 316.1938 – Ignition Interlock Devices
8
Justia Law. Florida Code 775.082 – Penalties, Applicability of Sentencing Structures
9
Florida Senate. Florida Code 324.023 – Financial Responsibility for Bodily Injury or Death
10
The Florida Legislature. Florida Code 322.61 – Disqualification From Operating a Commercial Motor Vehicle