Before you ever blow into the Intoxilyzer 8000, Florida law requires a 20-minute observation period. It is one of the most important rules in a breath case, and one of the most often broken.
The reason is simple. If anything brings alcohol from your stomach into your mouth in those final minutes, the machine can read that mouth alcohol as if it came from deep in your lungs, and the number climbs. The observation period exists to prevent exactly that. When it is not done right, the result cannot be trusted.
What the Rule Requires
Florida Administrative Code 11D-8 requires a law enforcement officer to observe you continuously for at least 20 minutes before a breath test. During that time you cannot burp, belch, regurgitate, vomit, eat, drink, smoke, or put anything in your mouth. The officer has to be watching you the whole time, with eyes on you rather than on paperwork or a phone. If any of those events happens, the clock is supposed to start over.
The requirement comes from Rule 11D-8.007, Florida Administrative Code, which directs that the operator reasonably ensure the subject has not taken anything by mouth and has not regurgitated for at least twenty minutes before the test.
The rule has a blind spot worth knowing. Florida law does not require the officer to check for or remove dentures, and dental adhesive can trap alcohol in the mouth that lingers past the full 20 minutes. See Schofield v. State. trapped alcohol can release slowly enough that the two breath samples still agree with each other, which means matching readings do not prove your mouth was clear.
Florida requires an officer to watch you continuously for 20 minutes before the test, so nothing brings alcohol up into your mouth. When the clock starts late, the officer looks away, or a burp or reflux slips through, the safeguard fails and the reading can run high.
Do not miss this
A breath reading at or above 0.08 also starts the 10-day license clock.
A breath result over the limit triggers an administrative suspension on top of the criminal case. You have 10 days from the arrest to demand a formal review hearing with the DHSMV in Clearwater, which protects your license and can secure a 42-day permit. We file that request the same day you hire us. Call or text (727) 761-4318.
How the Clock Breaks
In the real world, the 20 minutes rarely look like the rule. Officers start the clock when they think the arrest happened, not when continuous observation truly began. They turn to paperwork, load you into a car, walk you through booking, or step out of the room. Many cannot say, under oath, that they watched you the entire time. Each of those gaps is a place the result can fall.
Acid reflux and GERD make this worse, because they can push stomach contents up silently, with no burp an officer would notice. A person with reflux can fail the spirit of the rule while the officer believes it was followed. That is exactly the kind of detail mouth alcohol turns on.
One Case, in Detail
A client I will call Renee was in a crash on the Courtney Campbell Causeway. She had vomited at the scene, which is exactly the event the observation period is meant to catch, because vomiting brings stomach contents, and any alcohol with them, up into the mouth. The officer ran the breath test anyway. Using the machine logs, the bodycam footage, and the FDLE rules, we showed the observation period had been compromised. The breath result was discredited, and the case resolved as reckless driving with no DUI conviction.
The Evidence We Pull
We do not take the officer’s word for the 20 minutes. We pull the bodycam and breath room video, the CAD records that timestamp the night, and the breath test printout, and we line them up against each other. The video often shows what the report does not. See the full list of records we request.
Why This Matters in Your Case
A broken observation period can keep the breath result out of your trial entirely, or give a jury a clear reason to doubt it. As a forensic lawyer-scientist, I treat those 20 minutes as evidence, not a formality. See what that background covers.
What Counts as Observation
The rule is not satisfied by an officer who is merely in the room. Observation means continuous, attentive watching for the full period, close enough to know whether anything went into or came out of your mouth. An operator filling out paperwork, stepping away, processing another arrest, or looking at a screen is not observing. When the record shows the operator’s attention was elsewhere, the foundation for the twenty minutes weakens, and with it the assurance that no mouth alcohol reached the sample.
A burp, belch, regurgitation, or vomit during the period brings stomach air into the mouth and requires the full twenty minutes to begin again. A continued count after one is a defect.
What Resets the Clock
The purpose of the wait is to be sure no alcohol from the stomach or mouth contaminates the sample. So anything that could carry it forward, a burp, a belch, regurgitation, vomiting, or putting anything in the mouth, restarts the period from the beginning. These events are common and easy to miss, especially if the operator was not watching closely. If one happened and the count was not restarted, the result rests on a foundation the rule was written to prevent.
Proving the Gap
We test the observation with the records that exist, the operator’s notes and testimony, booking video, and the timing on the breath card, alongside your account of what happened in those minutes. Where the period was short, interrupted, or only nominally observed, it connects directly to mouth alcohol and slope detection, because the whole point of the wait is to keep mouth alcohol out of the number.
The twenty-minute observation looks like a small procedural step, and it is one of the most important safeguards in the whole test, because it is the only thing standing between mouth alcohol and your result. I look closely at whether you were truly watched or whether the officer was filling out forms, running the tag, or looking away, since observation in name only is not observation at all. When the record shows the period was not really kept, the reading that followed lost the one protection meant to keep it honest, and I make that failure part of your defense.
I started out as an Assistant Public Defender in Florida’s Thirteenth Judicial Circuit, in Tampa, and today I am one of six ACS-CHAL Forensic Lawyer-Scientists in Florida, with forensic training in how these instruments work. A breath result is an estimate produced by a machine, and I read its calibration history, its agreement checks, and the assumptions built into the number, so I can show a jury where it does not hold up. Learn more about my background.
Questions About the Observation Period
What is the 20-minute observation period?
Florida requires an officer to watch you continuously for at least 20 minutes before a breath test so that nothing, such as a burp, reflux, or vomiting, brings alcohol into your mouth and inflates the reading.
What happens if the officer does not watch the whole time?
If the continuous observation was broken, the result may be unreliable. It can be challenged, and in some cases excluded, because the safeguard against mouth alcohol was not followed.
Does a burp or acid reflux affect a breath test?
Yes. A burp, belch, or reflux in the minutes before the test can carry alcohol from your stomach into your mouth, and the machine can read that as a higher result. The observation period exists to catch it.
How do you prove the observation period was not followed?
We compare the officer’s report against the bodycam and breath room video, the CAD timestamps, and the breath printout. Gaps and contradictions in that record are where the challenge begins.
Related: the main breath test defense page, how we challenge a breath test, and mouth alcohol.
This page is general information, not legal advice, and it does not create an attorney-client relationship. Breath testing in Florida is governed by Fla. Stat. 316.1932 and 316.1934 and the Florida Administrative Code chapter 11D-8. Procedures and rules change, and every case turns on its own facts. Past results do not guarantee a similar outcome.
