When there was no warrant and no real consent, the State’s last route to your blood is an emergency. The legal name is exigent circumstances, and it lets officers act without a warrant when there is no time to get one. The key word is genuine. The State cannot simply say that alcohol leaves the bloodstream over time and call that an emergency. The Supreme Court rejected exactly that shortcut, and the result is a fact-specific test that the prosecution often cannot meet.
This matters most in crash cases, where officers feel pressure to draw blood quickly and sometimes skip the warrant on the theory that they had to act. Whether that theory holds depends on what the officer truly faced and whether a warrant was reasonably within reach. With electronic warrants available around the clock, the window for a true emergency has narrowed.
Exigency is not automatic. The court asks whether a warrant was reasonably available, and the natural dissipation of alcohol does not answer that by itself.
The broader rule. Exigent circumstances is a Fourth Amendment doctrine that reaches every kind of search. See Exigent Circumstances in the search and seizure section.
Where the Emergency Exception Comes From
The foundational case is Schmerber v. California, 384 U.S. 757 (1966), where the Supreme Court allowed a warrantless blood draw after a crash because the officer faced an emergency that left no time to seek a warrant while the defendant was being treated. For years, the State read Schmerber to mean that the loss of alcohol from the blood over time was always an emergency. The Court closed that door.
Dissipation Alone Is Not an Emergency
In Missouri v. McNeely, 569 U.S. 141 (2013), the Supreme Court held that the natural metabolizing of alcohol in the bloodstream does not create a categorical, per-se emergency that justifies skipping the warrant. Exigency in blood cases has to be decided case by case on the totality of the circumstances. The Court was direct about the practical point. Where police officers can reasonably obtain a warrant before a blood sample is drawn without significantly undermining the efficacy of the search, the Fourth Amendment mandates that they do so. Modern electronic-warrant procedures, where an officer can submit an affidavit and reach an on-call judge within minutes, were part of the Court’s reasoning, and they cut against the claim that there was no time.
If a warrant was reachable in the window, the dissipation of alcohol alone is not an emergency.
How Florida Courts Apply It
Florida courts apply McNeely directly. In State v. Liles, 191 So. 3d 484 (Fla. 5th DCA 2016), the court restated the baseline rule that to comply with the Fourth Amendment, officers must obtain a warrant or consent for a blood draw, or there must be some other exception. Florida courts have worked through that test in real crash cases, and the results turn on the facts. Where a fatal scene presented a severely compressed and chaotic timeline, courts have found a true emergency. In Aguilar v. State, 239 So. 3d 108 (Fla. 3d DCA 2018), a draw was upheld where the driver was unconscious, the scene was serious, and obtaining a warrant would have taken hours under the circumstances. In other cases, the exigency claim failed. Where there was no genuine causation tying the driver to a death or serious injury, or where the officer could have sought a warrant but did not bother, courts have refused to excuse the missing warrant. The lesson is that the label emergency has to be earned with specific facts, not assumed.
The Unconscious Driver
Mitchell v. Wisconsin, 588 U.S. 840 (2019), addressed the unconscious driver and recognized that when a driver is unconscious and needs medical treatment, the exigency analysis usually allows a warrantless draw, while leaving room for a defendant to show that his particular circumstances were different. That decision did not hand the State a blanket rule. It still leaves the door open to argue, on the specific facts, that a warrant was reasonably available and that the officer’s path to the blood ran through the hospital’s treatment rather than any true investigative emergency.
Special Needs Does Not Apply
Officers sometimes suggest that a blood draw after a crash serves a broad public-safety or administrative purpose that sidesteps the warrant rule. That argument runs into City of Indianapolis v. Edmond, 531 U.S. 32 (2000). Where the primary purpose of the search is to gather evidence for an ordinary criminal investigation, the special-needs and administrative-search doctrines do not apply, and the usual warrant requirement controls. A DUI blood draw is an investigative search aimed at producing a number for prosecution, which keeps it squarely inside the warrant rule.
How We Attack the Timeline
An exigency challenge is built on a clock. We reconstruct the minute-by-minute timeline from the crash to the draw using the computer-aided dispatch logs, the body-worn and dashboard video, the medical records, and any electronic-warrant logs. We look at how many officers were on scene, whether one of them could have started a warrant application while others handled the scene, how long the local on-call warrant process really takes, and whether the driver’s medical treatment, not any emergency, is what produced access to the blood. When the records show that a warrant was reasonably within reach, the emergency excuse collapses and the draw is open to suppression.
The State’s favorite shortcut in a blood case is to say the alcohol was leaving your body, so there was no time for a warrant. The Supreme Court closed that shortcut. Alcohol always dissipates, and if that alone were an emergency, the warrant requirement would vanish in every DUI, which is exactly what the Court refused to allow. So I go straight at the timeline, the minutes and the phone calls and the wait, and I make the State show a real emergency in your case and not just the ordinary passage of time. When the emergency is manufactured, the draw comes out.
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. I work both the science and the procedure in your case the way the State’s own analysts and officers are trained to, and I show a jury the exact point where the evidence does not hold up. Learn more about my background.
Questions About Exigent Circumstances
Can the police take my blood without a warrant in an emergency?
Sometimes. The exigent circumstances exception lets officers draw blood without a warrant when there is truly no time to get one. The State has to prove a real emergency on the facts, and the exception is narrow.
Isn’t the alcohol leaving my blood an emergency by itself?
No. In Missouri v. McNeely, the Supreme Court held that the natural dissipation of alcohol does not automatically create an emergency. Exigency is decided case by case, and where a warrant was reasonably available, officers were required to get one.
What if my crash involved a serious injury or a death?
A serious crash can create a genuine emergency, but it does not do so automatically. Florida courts decide it on the specific timeline and facts. Some draws have been upheld and others suppressed, depending on whether a warrant was reasonably within reach.
What about electronic warrants?
Electronic-warrant systems let officers reach an on-call judge in minutes. The Supreme Court pointed to that technology, and it makes the claim that there was no time to get a warrant much harder for the State to sustain.
Does it matter that I was unconscious?
It matters, but it is not a blanket rule. Mitchell v. Wisconsin recognized that unconscious-driver cases usually allow a warrantless draw while still leaving room to argue, on the facts, that a warrant was reasonably available.
How do you prove there was time for a warrant?
We rebuild the timeline from dispatch logs, video, medical records, and warrant logs, and we show how long the local warrant process really takes. When the records show a warrant was within reach, the emergency justification falls and we move to suppress.
Related: the blood draw warrant requirement, consent to a blood draw, misdemeanor versus felony warrants, and how we challenge a blood test.
This page is general information, not legal advice, and it does not create an attorney-client relationship. Blood testing and blood draws in Florida are governed by Fla. Stat. 316.1932 and 316.1933 and the Florida Administrative Code chapter 11D-8, and by the Fourth Amendment. Procedures and rules change, and every case turns on its own facts. Past results do not guarantee a similar outcome.
