You’ve been pulled over, questioned, and asked to blow into a machine on the side of the road. Maybe you didn’t feel drunk, but the breathalyzer test said otherwise. Now you’re facing a DUI charge in Pinellas County, and you’re wondering: Can this breath test really be trusted?

The role of breath tests in Pinellas County DUI arrests
Breath tests are a key tool used by law enforcement officers in DUI investigations throughout Pinellas County — from Clearwater Beach to downtown St. Pete. The Pinellas County Sheriff’s Office, local police departments, and even Florida Highway Patrol rely on breath testing machines to measure your blood alcohol concentration. But the accuracy of these devices isn’t always as straightforward as the results might suggest.
Why breath test results can be flawed
Breath test results are often treated as solid evidence in DUI cases. But that doesn’t mean they’re infallible. In fact, several issues can affect how reliable a breath test actually is, including:
- Improper calibration of the breathalyzer
- Mouth alcohol contamination from recent drinks, mouthwash, or vomiting
- Medical conditions like acid reflux or diabetes, which can interfere with breath readings
- Environmental factors such as nearby chemicals or radio interference
- Operator error by the arresting officer or testing personnel
Even a small deviation in protocol — such as not observing you for 20 minutes before the test — could affect the result and become a valid defense in your case.
Who operates breath tests in DUI cases?
In most DUI arrests in Pinellas County, the breath test is administered by certified DUI enforcement officers or law enforcement officers trained under Florida law. The equipment must meet standards set by the Florida Administrative Code and the results are often submitted directly to the State Attorney’s Office as part of the evidence in your DUI case.
But just because a law enforcement agency uses a breathalyzer doesn’t mean the device — or its results — are beyond challenge. Breath test results can and should be scrutinized, especially if the outcome hinges on them alone.
Breath test vs. other types of evidence
It’s important to remember that a DUI charge doesn’t rest solely on the breath test. Prosecutors may also rely on the arresting officer’s observations, blood tests, or even a urine test in some cases. If the breath test was the only evidence — and it has flaws — your defense attorney may have a stronger chance of getting the charges reduced or dismissed.
Blood tests are generally considered more accurate than breath tests, but they require a warrant and proper handling. If the arresting officer skips steps or fails to gather evidence properly, that could weaken the State’s case.
How to challenge questionable breath test results
If you believe your breath test results were inaccurate, an experienced DUI attorney can examine several aspects of your case:
- Was the breath testing machine properly maintained and calibrated?
- Did the officer follow required procedures under Florida law?
- Was there a valid reason for the initial stop and the DUI arrest?
- Are there medical or environmental factors that could explain a false high reading?
Any of these issues could call the test results into question — and that could make the difference between a conviction and a dismissal.

Hersem Law can help you fight inaccurate breath test results
If you’ve been arrested for DUI in Pinellas County and you’re unsure whether the breath test was reliable, Hersem Law can help. Are breath test results always accurate in Pinellas County? We’ve challenged flawed breathalyzer results, improper testing procedures, and weak evidence to protect our clients’ rights. With deep knowledge of local enforcement patterns and DUI laws, our team can help you understand what went wrong — and what comes next.
FAQ
Can I refuse a breath test in Pinellas County?
Yes, but under Florida law, refusal can lead to an automatic license suspension and be used against you in court — especially if it’s not your first DUI arrest.
How accurate are breathalyzer tests used by the Pinellas County Sheriff’s Office?
They are generally accurate when properly calibrated and administered, but real-world factors like medical conditions, mouth alcohol, or operator error can affect the results.
Can breath test results be thrown out in court?
Yes, if there’s evidence of improper procedure, faulty equipment, or contamination, your attorney may be able to suppress the results or have the charges reduced.
Do I need a lawyer if I think the breath test was wrong?
Absolutely. A DUI defense attorney can challenge the reliability of the test and investigate whether your rights were violated during the arrest or testing process.
What other evidence can the State use against me?
The prosecution may also use blood tests, officer observations, dashcam footage, or your own statements. Breath test results are only part of the picture.







