Challenging a breath reading in Florida usually means testing the process behind the number. A defense review looks at the stop, the 20 minute observation period, the Intoxilyzer 8000 records and the video for problems that could affect the result.
The number depends on the process behind it
Florida breath testing is done on the Intoxilyzer 8000, an instrument regulated by the Florida Department of Law Enforcement (FDLE). A result of 0.08 or higher can establish DUI on its own, which is why the breath reading often becomes the center of a case.
That reading is the last step in a chain of events. If an earlier step did not meet the legal or regulatory requirements, the reading may be open to challenge. Whether it is depends on what the records and the video actually show.
First question: was the stop lawful?
Before anyone looks at the instrument, the defense examines how the encounter began. Police need reasonable suspicion to stop a vehicle, and if the stop lacked a lawful basis, a motion to suppress can ask the court to exclude the evidence that followed, which can include a breath result.
The arrest gets the same scrutiny. Implied consent applies to a lawful breath test after a DUI arrest, so the legality of the arrest is part of the breath test analysis.
Checking the 20 minute observation period
Florida requires a 20 minute observation period before a breath test. The person is supposed to be observed during that time so that nothing occurring in the mouth affects the sample.
A defense review asks practical questions about it. Was the observation continuous? Who conducted it, and could that person actually see the subject the whole time? Booking video and the officer's own paperwork can confirm the timeline or contradict it.
What the Intoxilyzer 8000 records can reveal
Because FDLE regulates the instrument, there is a paper trail behind every test. In discovery, the defense receives the state's evidence, and that includes breath records. Those records can show how the specific instrument was maintained and whether the test sequence on that night ran as required.
Florida also allows depositions of witnesses in criminal cases, so the people involved in the testing can be questioned under oath. For a misdemeanor DUI, though, Florida's rules limit depositions, and the defense generally has to show good cause to take one. Gaps between the records, the written reports and the testimony deserve close attention.
If the breath result is excluded
Excluding a breath result does not end a DUI case by itself. The state can still try to establish impairment of normal faculties through driving behavior, officer observations, field sobriety exercises and video. A breath challenge is one part of a complete review, not the whole defense.
DUI Lawyers Shield Firm reviews breath records, video and reports as part of a free case review.
Keep reading
- Florida DUI Penalties in 2026: Every Level Explained
- DUI vs DWI in Florida: Which One Applies to Your Case
- Florida Implied Consent Explained: What Refusing a Breath Test Really Costs
General information only, not legal advice. Every case depends on its own facts, and prior results do not guarantee a similar outcome.
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