If a nurse drew your blood after a crash, or an officer said “warrant” and “blood” in the same sentence, you know the feeling. Somewhere in a lab there’s a tube with your name on it, and everyone around you is acting like whatever number comes out of that tube is the end of the story.
It isn’t. It’s the beginning of the question. That’s the whole point of my newest Safir Guide, The DUI Blood Test. Blood is my signature territory. I’m one of only six ACS-CHAL Forensic Lawyer-Scientists in Florida, and I spent 160 hours at Axion Analytical Labs in Chicago learning the same methods the State’s experts use. Before that, I was an Assistant Public Defender in the Thirteenth Judicial Circuit in Tampa, where hundreds of cases taught me that official-looking paper is not the same thing as proof.
Three things from the guide
1. Hospital blood and legal blood are not the same evidence
Legal blood is whole blood, drawn under Florida’s implied consent law or a warrant, and it comes with a statutory presumption that helps the prosecution. Hospital blood is different. It’s drawn to treat you, not to convict you, and it’s usually serum or plasma rather than whole blood. Here’s the chemistry that matters: serum reads higher than whole blood. Florida’s 0.08 limit contemplates whole blood, so a hospital number has to be converted, and that conversion produces a range of possible values, not one clean figure. The guide walks through why that gap gives the defense real room to work.
2. A badly stored sample can brew its own alcohol
This is the one my clients find hardest to believe. If a blood sample isn’t properly preserved and refrigerated, microorganisms inside the tube can turn blood sugar into alcohol. The sample ferments, and the number the lab measures days later can be higher than what was in your body at the draw. Delay makes it worse. Heat makes it worse. The good news is that fermentation leaves chemical footprints an expert can look for. The guide explains what those are and who has to demand the data that makes looking possible.
3. The license clock doesn’t wait for the lab
A qualifying blood result at or above 0.08 can trigger an administrative license suspension separate from the criminal case. You have 10 days to demand a formal review hearing with the DHSMV, and because blood results come back late, that window generally runs from when the result is reported. While the hearing is pending, you get a 42-day temporary permit. Miss the window and you’ve given something up before your case even starts.
Get the whole guide
The guide covers much more: the swab, the tube, the mixing, the chain of custody, and the discovery list I send in every blood case. It’s free, and one email unlocks the entire Safir Guides library at thesafirlawyer.com/free-guides. If you’d rather read on the web, the complete blood test section has the full coverage.
And if there’s blood in your case right now, skip the reading and call or text me at (727) 761-4318. Every case is different, and the earliest days are when the records are easiest to chase down.
You’re better Safir than sorry.
About the author
Rory Safir is a St. Petersburg attorney who handles injury claims and criminal defense across the Tampa Bay area. He is one of a handful of ACS-CHAL Forensic Lawyer-Scientists in Florida and a former Assistant Public Defender in Tampa, and he brings that same evidence-driven approach to fighting for injured clients.