Florida Ignition Interlock Requirements: Who Needs One and for How Long

When Florida Requires an Ignition Interlock Device

Under Florida Statute 322.2715, ignition interlock device (IID) requirements are tied directly to DUI conviction history and blood-alcohol level. The mandatory installation periods are:

"Continuous" is the operative word. Any tampering, removal, or failed breath test resets the compliance clock. The device must stay installed and functional for the entire mandatory period without interruption.

For first-time DUI offenders who blew under 0.15, installation is at the court's discretion. A judge may order it as a condition of probation even though it isn't statutorily mandatory. If you're in this category, the decision depends on the specific judge and the circumstances of your arrest.

What the Device Actually Does

An ignition interlock device connects to your vehicle's ignition system. Before starting the car, you blow into a breath sensor. If your breath-alcohol concentration registers above the programmed threshold (typically 0.025), the vehicle won't start.

The device also requires periodic rolling retests while driving — random prompts to blow again while the engine is running. These prevent someone from having a sober person start the car and then driving under the influence.

Every test result, start attempt, and bypass attempt is logged. The data is downloaded during monthly monitoring visits, and any violations are reported to the FLHSMV and the court. Common violations include failing a breath test, skipping a rolling retest, or having the device disconnected or powered off.

Installation and Monthly Costs

The FLHSMV maintains a list of state-approved IID providers. You cannot use an unapproved device — only installations from licensed Florida IID vendors satisfy the legal requirement.

Typical costs:

• Installation: $70–$100
• Monthly monitoring/calibration: $80–$120
• Removal fee: $50–$75

Over a six-month mandatory period, total IID costs typically run $550–$825. A two-year period climbs to $2,000–$3,000. These costs are paid directly to the IID provider and are separate from all other reinstatement fees, DUI school costs, and insurance premiums.

Most IID providers offer payment plans, and some Florida counties have indigency programs that reduce or waive IID fees for drivers who demonstrate financial hardship. Ask your IID provider about reduced-fee programs before installation.

How IID Connects to DUI Reinstatement

The ignition interlock requirement is one piece of the DUI reinstatement process, not the whole picture. A typical DUI reinstatement path includes:

1. Serving the mandatory hard suspension period (30 or 90 days, depending on whether you took or refused the breath test)
2. Enrolling in and completing DUI school (Level I or Level II)
3. Obtaining FR-44 high-risk insurance and having it filed electronically with FLHSMV
4. Installing the IID if required by statute or court order
5. Applying for a hardship license through the Bureau of Administrative Reviews
6. Paying the $130 DUI administrative reinstatement fee at a tax collector office

The IID must typically remain installed for the entire hardship license period. If you're driving on a Business Purposes Only (BPO) hardship license with an IID requirement, the device stays in your vehicle until the mandatory period expires and the court confirms compliance.

Common Compliance Mistakes

Not calibrating on schedule. IID providers require monthly calibration and data download appointments. Missing a scheduled appointment counts as a violation and can extend your mandatory period or result in a probation violation report.

Using mouthwash or certain foods before starting your car. Products containing alcohol — mouthwash, certain cough syrups, fermented foods — can trigger a false positive. Wait at least 15 minutes after using any of these products before attempting a start.

Letting someone else blow into the device. This is a criminal offense in Florida (circumvention of an IID), not just a compliance violation. It can result in additional criminal charges on top of whatever consequences the original DUI carries.

If you're navigating the interlock requirement alongside other holds on your license, the Florida Driver's License Reinstatement Guide sequences every DUI reinstatement step — from the 10-day rule decision through IID compliance — so you address each requirement in the correct order.

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