Can Police Get a Blood Sample After a Florida DUI Arrest?
You refused the breath test—but can police still test your blood? The answer depends on several important factors.
Many Florida drivers believe refusing a breath test prevents law enforcement from obtaining any chemical evidence in a DUI case.
That’s not always true.
Although breath testing is the most common method used during a DUI investigation, there are situations where officers may seek a blood sample instead. Whether they can legally do so depends on the facts of the case, the type of investigation, and the legal authority supporting the request.
Understanding when police may obtain a blood sample—and what rights drivers have—can help clear up one of the most misunderstood aspects of Florida DUI laws.
How Chemical Testing Works in Florida DUI Cases
After a DUI arrest, officers often seek chemical evidence to determine whether alcohol or drugs may have impaired the driver’s ability to operate a vehicle safely.
The type of test requested depends on the circumstances.
Breath Tests Are Most Common
In most DUI investigations involving suspected alcohol impairment, officers request a breath test.
Florida’s Implied Consent Law, found in Florida Statute 316.1932, generally requires drivers who are lawfully arrested for DUI to submit to an approved breath test.
Breath testing is quick, widely used, and often becomes an important piece of evidence in a DUI prosecution.
Blood Tests Are Less Common
Unlike breath testing, blood testing is not requested in every DUI case.
Instead, officers typically pursue a DUI blood test in Florida only when specific legal circumstances exist, such as:
- Serious bodily injury crashes.
- Fatal traffic accidents.
- Investigations involving suspected drug impairment.
- Situations where other legal authority permits blood collection.
Because blood draws involve a more intrusive search, they are subject to additional constitutional and statutory requirements.
Can Police Automatically Take Your Blood?
No.
A DUI arrest alone does not automatically give law enforcement the authority to obtain a blood sample.
Whether officers may request—or require—a blood draw depends on the facts of the investigation.
Serious Injury and Fatal Crash Cases
Florida law provides specific authority for blood testing when a DUI investigation involves death or serious bodily injury.
If an officer has probable cause to believe an impaired driver caused serious bodily injury or death, Florida Statute § 316.1933 requires the driver to submit to a blood test. The statute also permits law enforcement to use reasonable force if necessary to obtain the sample.
These cases may involve additional evidence such as crash reconstruction, vehicle data, witness statements, surveillance footage, and medical records.
What If You Refuse a Breath Test?
Many drivers assume that refusing a breath test prevents officers from obtaining any chemical evidence.
That isn’t necessarily correct.
Refusing Doesn’t End the Investigation
Even after a refusal, officers may continue gathering other evidence, including:
- Officer observations.
- Witness testimony.
- Field sobriety exercise results.
- Body camera recordings.
- Dash camera footage.
- Statements made during the investigation.
Depending on the facts, investigators may also determine that a blood sample should be sought under applicable law.
Refusal Has Separate Consequences
Refusing a lawful breath or urine test can have consequences separate from the DUI charge.
A qualifying refusal can result in a one-year driver’s license suspension for a first refusal or an 18-month suspension for a subsequent refusal. Under Florida law effective October 1, 2025, a qualifying first refusal of a lawful breath or urine test can also be a second-degree misdemeanor, while a second or subsequent qualifying refusal can be a first-degree misdemeanor.
Refusing a breath test does not necessarily prevent law enforcement from seeking other legally authorized chemical evidence, including a blood sample in circumstances permitted by Florida law.
Blood Tests and Suspected Drug Impairment
Not every DUI involves alcohol.
Some investigations focus on prescription medications, illegal drugs, or combinations of substances that may impair driving ability.
Why Blood Testing May Be Requested
Unlike alcohol, many drugs cannot be accurately measured using a breath-testing instrument.
Depending on the circumstances, investigators may seek a Florida DUI blood sample when they believe chemical analysis is necessary to determine whether drugs contributed to the driver’s impairment.
Drug Recognition Evaluations
Officers may also request assistance from specially trained Drug Recognition Experts (DREs).
These evaluations involve multiple observations designed to help determine whether impairment may be associated with certain categories of drugs.
Like other evidence collected during a DUI investigation, those observations become part of the overall case and are evaluated alongside chemical testing, witness statements, and other investigative findings.
Drivers facing DUI investigations often have questions about breath tests, implied consent, driver’s license suspensions, and Florida criminal procedures. Many of those topics are discussed throughout the RHINO Lawyers Traffic Ticket Blog, where you’ll find practical information about Florida DUI and traffic laws.
Do Police Need a Warrant for a Blood Draw?
One of the most common questions after a DUI arrest is whether law enforcement can simply order a blood test.
The answer depends on the circumstances.
Because drawing blood is considered a search under the Fourth Amendment, officers generally must have legal authority before obtaining a sample. That authority may come from a warrant, a recognized exception to the warrant requirement, or another circumstance authorized under Florida law.
When a Search Warrant May Be Used
If investigators believe a blood sample contains important evidence, they may ask a judge to issue a search warrant.
To obtain one, officers typically must establish probable cause supporting their request.
A warrant may become relevant in investigations involving:
- Serious injury crashes.
- Fatal collisions.
- Suspected drug impairment.
- In cases where a breath test cannot adequately address the evidence that investigators are seeking.
Whether a warrant was properly obtained and executed may become an important legal issue during the case.
Exceptions May Apply
Certain DUI investigations involve circumstances where Florida law or constitutional exceptions may permit blood testing without following the same procedures used in routine traffic stops.
Whether those exceptions apply depends entirely on the specific facts of the investigation.
Because every case is unique, the legality of a blood draw often requires a careful review of both the evidence and the procedures used by law enforcement.
Can Blood Test Results Be Challenged?
Yes.
Like any other evidence in a criminal case, blood test results are subject to review.
A blood sample is not automatically accepted simply because it was collected during a DUI investigation.
Collection Procedures Matter
Attorneys frequently examine how the sample was obtained.
Questions may include:
- Was the blood draw legally authorized?
- Was the sample collected by qualified medical personnel?
- Were proper collection procedures followed?
- Was the sample stored correctly?
- Was contamination prevented?
Errors during collection or handling may affect the reliability of the evidence.
Laboratory Testing Is Also Reviewed
After collection, the blood sample typically undergoes laboratory analysis.
That process may involve reviewing:
- Chain of custody documentation.
- Laboratory protocols.
- Testing methods.
- Quality control procedures.
- Instrument calibration.
- Analyst qualifications.
Each step is important because prosecutors rely on laboratory findings when presenting chemical evidence in court.
What Should You Do After a DUI Arrest?
Whether your case involves a breath test, a blood draw, or allegations of drug impairment, the actions you take afterward can be important.
If you’ve been arrested for DUI in Florida:
- Carefully review the paperwork provided by law enforcement.
- Keep track of driver’s license deadlines.
- Write down everything you remember while the details are fresh.
- Preserve receipts, photographs, or other relevant evidence.
- Avoid discussing your case on social media.
- Consider speaking with a Florida DUI attorney before making significant legal decisions.
Every DUI investigation is different, and understanding the evidence early can help you make informed decisions as your case progresses.
How RHINO Lawyers Can Help
Blood draw cases often involve complex legal and scientific issues that extend well beyond a routine DUI investigation. Questions about search warrants, implied consent, laboratory procedures, constitutional protections, and the admissibility of evidence may all become part of the defense.
At RHINO Lawyers, we carefully review every aspect of the State’s case, including the circumstances surrounding any blood draw, the collection process, laboratory testing, and the evidence supporting the arrest. Our attorneys help clients understand the charges they face and the legal options available under Florida law.
If you’ve been arrested for DUI and police obtained—or attempted to obtain—a blood sample, call (844) RHINO-77 to schedule a confidential consultation. We’ll review your case, answer your questions, and explain what comes next.
Frequently Asked Questions
Can police take my blood after a Florida DUI arrest?
Not automatically. Whether officers may obtain a blood sample depends on the facts of the investigation and the legal authority supporting the blood draw.
Is a blood test more accurate than a breath test?
Blood testing and breath testing measure different things and are governed by different legal and scientific procedures. The significance of either test depends on the circumstances of the case.
Can I refuse a blood test?
The answer depends on the situation. Certain DUI investigations involving serious bodily injury, fatalities, or search warrants may involve different legal considerations than a routine DUI arrest.
Do police always need a search warrant for a blood draw?
Not always. Whether a warrant is required depends on the facts of the investigation and applicable constitutional and statutory law.
What if the police suspect I was impaired by drugs instead of alcohol?
Because many drugs cannot be measured through breath testing, investigators may pursue additional evidence, including blood testing when authorized by law.
Can blood test evidence be challenged?
Yes. Attorneys may review issues involving legal authority, collection procedures, laboratory analysis, chain of custody, and the reliability of the testing process.
Will refusing a breath test prevent police from obtaining a blood sample?
Not necessarily. Depending on the circumstances, investigators may still pursue a blood sample if Florida law or other legal authority permits it.
Should I speak with a DUI attorney after a blood draw?
Because blood draw cases often involve complex constitutional, medical, and scientific issues, many drivers choose to consult an attorney to better understand their rights and legal options.
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