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Yes. Indiana police can obtain a forced blood draw during a DUI investigation when they have lawful authority, which commonly means obtaining a search warrant. A blood draw is a Fourth Amendment search, so, absent a warrant, police generally cannot force one simply because alcohol naturally disappears from the bloodstream.
Picture yourself driving down an Indiana highway. Suddenly, red and blue lights appear in your rearview mirror.
Maybe you were speeding. Maybe the officer says you crossed the center line. After reaching your window, the officer notices the smell of alcohol, bloodshot eyes, slurred speech, or problems with balance.
Now the traffic stop has turned into a DUI investigation.
If an officer asks you to take a chemical test and you refuse, that does not necessarily prevent a blood test. Police may seek a search warrant authorizing a blood draw.
In Missouri v. McNeely, the U.S. Supreme Court rejected a blanket rule allowing warrantless blood draws merely because alcohol dissipates naturally. The Court emphasized that compelled blood draws are significant bodily intrusions. Whether an exception to the warrant requirement applies depends on the circumstances.
In plain English, disappearing evidence does not automatically erase the Fourth Amendment.
Modern warrant procedures can move quickly. An officer seeking a warrant must provide facts supporting probable cause for the requested search.
In a DUI investigation, those facts may include observations such as:
A judge reviews the probable-cause information. If the judge issues the warrant, police can use that judicial authorization to obtain the blood sample.
The warrant matters because it places a judge between the officer and a forced intrusion into someone’s body.
Yes. A search warrant does not automatically make every later step in the blood-testing process flawless.
Blood evidence has multiple stages. Collection, labeling, storage, transportation, chain of custody, and laboratory analysis can all matter.
The Indiana State Department of Toxicology uses specialized blood evidence collection kits. Those kits contain two gray-top tubes with sodium fluoride and potassium oxalate. The Department also provides procedures for labeling, sealing, transporting, and documenting specimens.
A defense attorney may examine questions such as:
Think of blood evidence as a chain. The laboratory number at the end is only one link.
Timing can become especially important when police do not encounter the driver immediately.
Imagine a driver leaves the roadway at 8:00 p.m. The vehicle sits in a ditch. An officer encounters the driver later and begins a DUI investigation. By the time a blood sample is collected, several hours may have passed since the person last operated the vehicle.
Indiana Code sections 9-30-6-2 and 9-30-6-15 address the timing of chemical testing. When the statutory requirements are satisfied, a test within the applicable three-hour period can support a rebuttable presumption relating the alcohol concentration at testing back to operation. Indiana courts have explained that the relevant analysis connects the test to the time the vehicle was last operated.
“Rebuttable” is important. It means the presumption can be challenged.
A blood draw outside the three-hour period does not automatically disappear from the case.
Instead, the State can lose the benefit of the statutory presumption. Indiana appellate courts have recognized that prosecutors may then use extrapolation evidence to try to relate the later alcohol concentration back to the earlier time of driving.
That creates another area for scrutiny.
Alcohol concentration changes over time as alcohol is absorbed and eliminated. Estimating an earlier alcohol concentration can therefore depend heavily on the assumptions and information used by the expert.
A defense attorney can examine those assumptions, the available timeline, and the facts provided to the toxicologist.
Refusing a chemical test carries separate driver’s-license consequences under Indiana’s implied-consent laws.
Indiana Code section 9-30-6-9 provides for a one-year suspension when a qualifying refusal is reported. If the person has at least one previous OVWI conviction, the suspension is two years.
That means refusal can create two problems at once.
You may face the administrative consequences of refusing, while police may still seek legal authority for a blood draw. Indiana’s own impaired-driving guidance also warns drivers that refusing a certified chemical test triggers a license suspension.
No. A blood result can be important evidence, but it does not answer every legal question in a DUI case.
The warrant can matter. The timeline can matter. The collection process can matter. The handling of the sample can matter. The laboratory analysis can matter. If extrapolation testimony is involved, the assumptions behind that testimony can matter too.
That is why a blood-draw case should be examined piece by piece rather than reduced to a single laboratory number.
The Marc Lopez Law Firm’s established approach to Indiana criminal-defense writing emphasizes breaking legal rules into practical questions ordinary people can understand.
If you have been charged with an Indiana DUI or have questions about a forced blood draw, contact the Marc Lopez Law Firm at 463-238-4579 to speak with a lawyer today.
And remember—always plead the 5th.