How a Criminal Defense Attorney Challenges Breath Test Evidence in Florida DUI Cases
Many people believe their case is over the moment they learn their breath alcohol reading was above the legal limit. Police officers often reinforce that belief during an arrest. Prosecutors frequently rely on breath test numbers as the centerpiece of their cases. However, a breath test reading above .08 does not automatically mean a conviction is inevitable.
I have represented many people charged with DUI who assumed there was no defense because the breath machine produced a result above the legal limit. In reality, breath test evidence can be challenged in numerous ways. The machine itself may have problems. The officer administering the test may have failed to follow required procedures. Medical conditions, environmental factors, and maintenance issues can all affect the accuracy of a breath alcohol reading.
Florida law allows prosecutors to use breath test results as evidence in a DUI case, but those results are not immune from challenge. Every piece of evidence presented by the government must withstand scrutiny. A private attorney can investigate the circumstances surrounding the arrest, analyze the breath testing process, and identify weaknesses that may support a reduction of charges, reduced penalties, or dismissal.
When facing a DUI charge, it is important to understand that the breath test is only one part of the State's case. The prosecution must still prove guilt beyond a reasonable doubt. That burden remains on the government regardless of what the breath machine reported.
How Florida DUI Law Defines Impairment
Florida Statute § 316.193 is the primary DUI statute.
The law provides that a person commits DUI if he or she is driving or in actual physical control of a vehicle while under the influence of alcoholic beverages, chemical substances, or controlled substances to the extent that normal faculties are impaired, or has a blood alcohol level or breath alcohol level of 0.08 or higher.
Rather than relying solely on the statutory language, the practical effect of the law is that prosecutors can pursue DUI charges under two different theories. They may attempt to prove impairment of normal faculties or attempt to prove an unlawful breath or blood alcohol concentration.
Many people focus entirely on the breath test number and overlook the fact that the State must establish the reliability of that evidence. If the breath test result can be challenged successfully, the prosecution's case may become substantially weaker.
This is one reason why hiring a private attorney immediately after an arrest can be important. Time-sensitive evidence often exists, including body camera footage, maintenance records, observation logs, and witness statements. The sooner an attorney begins investigating, the more opportunities there may be to uncover favorable evidence.
Why Breath Test Results Are Not Always Accurate
Criminal Defense Attorney Analysis of Breath Testing Problems
Breath testing devices are scientific instruments. Like all scientific instruments, they are subject to error.
Several factors can affect the reliability of a breath test result:
- Improper machine calibration.
- Failure to perform required maintenance.
- Radio frequency interference.
- Residual mouth alcohol contamination.
- Certain medical conditions.
- Operator error.
Florida uses approved breath testing instruments that must be inspected and maintained according to strict regulations. If the required procedures are not followed, the reliability of the test result may be called into question.
For example, gastroesophageal reflux disease, commonly known as GERD, can affect breath testing because alcohol from the stomach may be introduced into the mouth. This can create artificially elevated readings.
Similarly, dental work, mouthwash, chewing tobacco, and certain medical conditions may interfere with the testing process.
Many people are surprised to learn that breath machines do not directly measure blood alcohol concentration. Instead, they estimate blood alcohol levels based on breath samples and mathematical assumptions. Those assumptions are not always accurate for every individual.
A private attorney can obtain maintenance records, calibration records, and testing logs to determine whether the machine was functioning properly at the time of the arrest.
Florida's Breath Testing Requirements
Florida law imposes strict requirements regarding breath testing procedures.
Florida Statute § 316.1932 contains Florida's implied consent provisions. The statute generally provides that anyone who accepts the privilege of driving in Florida is deemed to have consented to lawful breath, blood, or urine testing under certain circumstances.
The statute also establishes procedures that law enforcement officers must follow when requesting a breath test.
Before administering a breath test, officers are generally required to conduct an observation period to ensure the subject does not eat, drink, smoke, vomit, or place anything in the mouth that could affect the results.
Failure to follow these procedures may create opportunities to challenge the admissibility or reliability of the test results.
When I review a DUI case, I carefully examine:
- Whether the stop was lawful.
- Whether probable cause existed for the arrest.
- Whether proper observation procedures were followed.
- Whether the machine was properly maintained.
A weakness in any one of these areas may significantly affect the prosecution's case.
Common Defenses When the Breath Test Is Over .08
Criminal Defense Attorney Strategies for Challenging High Breath Test Results
Many defenses may apply even when a breath test result exceeds the legal limit.
Some of the most common include:
- Lack of probable cause for the traffic stop.
- Unlawful arrest.
- Improper administration of field sobriety exercises.
- Failure to conduct the required observation period.
- Breath machine maintenance issues.
- Operator certification problems.
- Medical conditions affecting results.
- Rising blood alcohol defenses.
The rising blood alcohol defense is particularly important. Alcohol absorption takes time. A person's blood alcohol level may be below the legal limit while driving but rise above the legal limit later during testing.
In some cases, a significant amount of time passes between the traffic stop and the breath test. During that period, alcohol absorption may continue.
Prosecutors often assume that the test result accurately reflects the driver's condition while operating the vehicle. That assumption may not always be correct.
A private attorney can examine timelines, receipts, witness statements, surveillance footage, and expert opinions to determine whether a rising alcohol defense may apply.
Challenging the Traffic Stop and Arrest
Many successful DUI defenses have nothing to do with the breath machine itself.
The Fourth Amendment protects individuals from unreasonable searches and seizures. Law enforcement officers generally need reasonable suspicion to conduct a traffic stop.
If the stop was unlawful, important evidence may be excluded from court.
Likewise, officers must establish probable cause before making an arrest.
Some common issues include:
- Mistaken observations.
- Misinterpretation of driving behavior.
- Inadequate investigation.
- Reliance on unreliable information.
I often find cases where the officer exaggerated driving behavior or incorrectly interpreted innocent conduct as signs of impairment.
If the stop or arrest violated constitutional protections, a motion to suppress evidence may significantly weaken the prosecution's case.
This is another reason why private legal representation can be valuable. A detailed review of the officer's actions may reveal constitutional violations that are not obvious from the arrest report alone.
Real Case Example Involving a High Breath Test Result
I represented a client who was arrested after being stopped for allegedly weaving within a lane. The officer administered field sobriety exercises and later obtained a breath test result above the legal limit.
At first glance, the case appeared difficult because the reported breath alcohol level exceeded .08.
After obtaining the maintenance records for the breath testing machine, I discovered inconsistencies involving required inspections and documentation.
I also reviewed body camera footage showing that the required observation period had not been properly completed before the breath sample was collected.
Further investigation revealed that my client suffered from GERD, a condition capable of affecting breath test reliability.
After presenting these issues, the prosecution's confidence in the breath evidence weakened considerably. The case was ultimately resolved without a DUI conviction.
Without a thorough investigation, these issues would likely have gone undiscovered.
Consequences of a DUI Conviction in Florida
A DUI conviction can carry significant consequences.
Depending on the circumstances, penalties may include:
- Jail time.
- Probation.
- Driver's license suspension.
- Ignition interlock requirements.
- Community service.
- Substantial fines.
- Increased insurance costs.
Additional penalties may apply when aggravating circumstances exist, such as high breath alcohol levels, prior DUI convictions, property damage, bodily injury, or minor passengers.
Because the consequences can be severe, every available defense should be explored. A private attorney can evaluate the evidence, negotiate with prosecutors, and pursue alternatives that may not otherwise be available.
Why Hiring a Private Attorney Matters
Criminal Defense Attorney Representation Can Make a Difference
Many DUI cases involve highly technical evidence. Breath testing records, machine maintenance logs, calibration data, toxicology principles, and constitutional issues all require careful analysis.
When I represent someone charged with DUI, I do far more than review the arrest report. I investigate every aspect of the case.
This often includes:
- Obtaining body camera and dash camera footage.
- Reviewing maintenance records.
- Examining officer training and certifications.
- Analyzing testing procedures.
Prosecutors rely heavily on breath test evidence because many people assume the results are impossible to challenge. That assumption is often incorrect.
A private attorney can identify weaknesses, negotiate from a position of strength, and fight for reduced charges, reduced penalties, or dismissal whenever supported by the evidence.
Criminal Defense FAQs
Can you fight a DUI if your breath test was over .08?
Yes. A breath test result above .08 does not automatically guarantee a conviction. Breath testing procedures, machine maintenance, medical conditions, constitutional issues, and evidentiary challenges may provide defenses depending on the circumstances.
Can a breathalyzer be wrong?
Yes. Breath testing devices can produce inaccurate results due to calibration problems, maintenance issues, operator errors, radio frequency interference, or medical conditions affecting the test.
What is the legal limit in Florida?
Florida generally sets the legal breath alcohol limit at 0.08 for most drivers. Commercial drivers and drivers under 21 may face different standards and consequences.
Can GERD affect a breath test?
Yes. GERD and certain other digestive conditions may cause alcohol vapors from the stomach to enter the mouth, potentially producing artificially elevated breath test readings.
What is the observation period before a breath test?
Florida procedures generally require officers to observe the subject before testing to ensure nothing occurs that could contaminate the breath sample. Failure to comply with these requirements may affect the reliability of the results.
Can a DUI be reduced to reckless driving?
In some cases, yes. Depending on the evidence, criminal history, and circumstances of the arrest, prosecutors may consider a reduction to reckless driving or another resolution.
Does refusing a breath test help your case?
Refusing a breath test carries separate consequences under Florida's implied consent laws, including potential license suspensions. Whether refusal helps or hurts depends on the facts of the specific case.
Do I need a lawyer if I failed the breath test?
Absolutely. Even when the reported breath alcohol level exceeds the legal limit, many defenses may exist. An attorney can investigate the evidence, challenge the prosecution's case, and seek the best possible outcome.
Call Our Criminal Defense Attorney For A Free Consultation
If you were arrested for DUI and your breath test was over the legal limit, do not assume the case is hopeless. Breath test evidence can be challenged, procedures can be questioned, and defenses may exist that are not immediately obvious. Every DUI case deserves a thorough investigation.
Contact Musca Law 24/7/365 at 1-888-484-5057 For Your FREE Consultation
Musca Law, P.A. has a team of experienced criminal defense attorneys dedicated to defending people charged with a criminal or traffic offense. We are available 24/7/365 at 1-888-484-5057 for your FREE consultation. We have 35 office locations throughout the state of Florida and serve all counties in Florida, including Jacksonville, Miami, Tampa, Orlando, St. Petersburg, Hialeah, Port St. Lucie, Cape Coral, Tallahassee, Fort Lauderdale, the Florida Panhandle, and every county in Florida.