Ignition Interlock: Will It Apply to First Time DUIs?

If you have been arrested for a first-time DUI in Tampa or anywhere in Florida, you may be wondering whether an ignition interlock device will be required as part of your sentence. The answer depends on your blood alcohol concentration (BAC) at the time of arrest, the circumstances of your case, and whether you are convicted or complete a diversion program. Here is what you need to know about Florida’s current ignition interlock requirements and how a Tampa DUI defense lawyer can help you minimize the consequences.

What Is an Ignition Interlock Device?

An ignition interlock device (IID) is a breathalyzer unit installed in your vehicle that requires you to provide a breath sample before the engine will start. If your breath alcohol concentration exceeds the programmed threshold (typically 0.025%), the vehicle will not start. The device also requires periodic “rolling retests” while you are driving, which require random breath samples at intervals during your trip, to ensure you have not consumed alcohol after starting the car.

Typical costs: Installation costs range from $100 to $250, depending on the provider and your vehicle type. Monthly monitoring, calibration, and maintenance fees range from $50 to $100 per month. You are responsible for all costs.

Typical duration: For a first-time DUI with a BAC of 0.15% or higher, Florida law requires a minimum of 6 months of interlock. For a second DUI, the minimum is 1 year. For a third DUI within 10 years, the minimum is 2 years.

When Does an Ignition Interlock Apply to a First DUI in Florida?

Under current Florida law (Florida Statute §316.193), ignition interlock requirements for a first-time DUI depend primarily on your BAC level:

First DUI with BAC Below 0.15%

For a standard first DUI with a BAC between 0.08% and 0.149%, an ignition interlock device is not mandatory under the statute. However, a judge has the discretion to order an interlock as a condition of probation or as part of a hardship license. Your first DUI defense attorney can argue against interlock if it is not required by statute.

First DUI with BAC of 0.15% or Higher

If your BAC was 0.15% or higher at the time of arrest, or if a minor was in the vehicle, Florida law requires a mandatory minimum of 6 months of ignition interlock upon conviction. The judge may order a longer period. This is in addition to fines, license suspension, DUI school, community service, and possible jail time.

First DUI with Chemical Test Refusal

If you refused the chemical test (breath, blood, or urine) after arrest, you face a 12-month administrative license suspension. The court may also order an ignition interlock as a condition of any hardship license granted during the suspension period. Refusing a breathalyzer in Florida carries its own set of consequences.

Federal Legislation Update

The original article on this page discussed a 2017 federal bill (“Alisa’s Law”) introduced by Congresswoman Lowey that would have required all states to mandate ignition interlock for first-time DUI offenders. That bill did not pass. As of 2026, interlock requirements for first DUI offenses remain a state-by-state decision, and Florida’s requirements are governed by §316.193 as described above.

How Ignition Interlock Interacts with License Suspensions and Criminal Sentences

It is important to understand that interlock requirements and license suspensions are separate but overlapping consequences of a DUI:

• Administrative License Suspension (ALS): Imposed by the DHSMV within days of your arrest, triggered by a chemical test failure or refusal. This is a civil penalty, separate from the criminal case. The administrative license suspension process has strict deadlines that can affect your driving privileges.
• Criminal Court Suspension: If convicted of DUI, the court imposes a separate license suspension as part of your criminal sentence.
• Ignition Interlock: If required (either by statute or judicial discretion), the interlock is installed on your vehicle and allows you to drive during the suspension period for essential purposes. Without an interlock, you may be limited to a hardship license with restricted driving hours and destinations.

The Hardship License Pathway

If your license is suspended through the ALS or a criminal conviction, you can apply for a hardship license that allows limited driving (to work, school, church, medical appointments). If an interlock is required, it must be installed before the hardship license is issued. The interlock effectively becomes your ticket to drive during the suspension period. The DUI court process in Florida includes several stages where interlock conditions may be addressed.

What to Do Right Now If You Are Facing a First DUI

If you have been arrested for a first-time DUI in Tampa, take these steps immediately to protect your license and fight the charges:

• Do not self-incriminate. Invoke your right to remain silent. Do not discuss the case with police, friends, family, or on social media.
• Request your DHSMV administrative hearing within 10 days. This is the most time-sensitive deadline in your case. Filing the request also grants you a 42-day temporary driving permit. Knowing what to do the day after a DUI can help you meet critical deadlines.
• Preserve all evidence. Save receipts, text messages, and any documentation that establishes your timeline for the evening. Write down everything you remember about the stop and arrest.
• Challenge the breath test results. Breathalyzer machines have documented reliability issues. If the BAC result is successfully challenged, you may avoid both the DUI conviction and the interlock requirement. There are several ways a breathalyzer can produce inaccurate results.
• Contact a Tampa DUI lawyer immediately. Call (813) 694-5778. An experienced attorney can challenge the traffic stop, the breath test, and the prosecution’s entire case, potentially avoiding the interlock requirement altogether.

Talk to a Tampa DUI Lawyer About Your Interlock Options

An ignition interlock device costs hundreds of dollars, creates daily inconvenience, and carries social stigma. But it is only required upon conviction for certain DUI offenses. An experienced DUI defense attorney can fight the charges and potentially eliminate the interlock requirement entirely.

Attorney Brett Metcalf is a former Hillsborough County prosecutor who has handled thousands of DUI cases. He understands how to challenge breath test results, suppress illegally obtained evidence, and negotiate favorable outcomes.

Call (813) 694-5778 now or contact us online for a free, confidential consultation. Our Tampa DUI defense attorneys handle cases at every stage, including first-time DUI defense. Understanding whether your license is suspended immediately after a DUI in Florida is an important first step, and our Tampa criminal defense attorneys can help you navigate both proceedings.