Category: Traffic Offenses · Statute: F.S. 316.1937 · Source: Florida Legislature
Understanding DUI Ignition Interlock (Detailed) in Florida
In Florida, an Ignition Interlock Device (IID) is a vehicle-mounted breathalyzer wired directly into the ignition system. Under Florida Statute Section 316.1937, a driver must blow into the device and register a blood alcohol concentration (BAC) below 0.025% for the engine to start. Once the vehicle is in motion, the device requires periodic "rolling retests" to ensure the driver remains sober. If the driver fails a retest or misses the prompt, the IID logs the violation and triggers an alarm—such as flashing lights or a sounding horn—until the vehicle is turned off or a clean sample is provided.
The installation of an IID is a mandatory administrative and criminal penalty for many Florida DUI offenders. While a first-time DUI conviction with a BAC under 0.15% may only result in court-ordered installation at the judge's discretion, it becomes mandatory for at least six months if the BAC was 0.15% or higher, or if a minor was in the vehicle. For a second DUI conviction, Florida law mandates an IID for at least one to two years depending on the timing of the prior offense, and a third conviction requires a minimum of two years. Defendants must pay all installation, calibration, and monthly monitoring fees out of pocket.
How Ignition Interlock Requirements Impact Florida Bail and Pretrial Release
During the pretrial phase, a Florida judge may impose the installation of an ignition interlock device as a mandatory condition of bond or supervised pretrial release. Under Florida Statute Section 903.047, judges have broad authority to protect the public, meaning defendants with pending DUI charges—especially those involving high BAC levels, multiple prior offenses, or accidents—must often prove IID installation before they are permitted to drive while out on bail. Violating this pretrial condition by driving a vehicle without an IID can result in immediate bail revocation and re-arrest.