Can a DUI Charge Be Dismissed in Tennessee Because of Police Mistakes?

 Posted on June 28, 2026 in DUI/DWI/BUI

A DUI charge in Tennessee can sometimes be dismissed because of police mistakes. Officers are required to follow specific rules at every stage of a DUI stop, and when they do not, the evidence they gathered may not be allowed in court. Without that evidence, the prosecution's case can fall apart. If you are facing a DUI charge in 2026, an Anderson County DUI defense lawyer can look at what happened and find out whether police mistakes can help your case.

What Kind of Police Mistakes Can Affect a Tennessee DUI Case?

Not every mistake an officer makes will result in a dismissal, but some mistakes are serious enough to change the outcome of a case. The key is whether the mistake violated your rights or affected the reliability of the evidence being used against you.

Was the Traffic Stop Legal in the First Place?

This is one of the first things your attorney will check. Before pulling you over, an officer needs reasonable suspicion that a traffic violation or criminal activity is happening. They have to point to specific facts, not just a feeling.

Under the Fourth Amendment, you are protected from unreasonable searches and seizures. If an officer pulled you over without a real legal reason, everything that happened after that stop may be thrown out. That includes what the officer observed, the field sobriety test results, and any chemical test results.

Tennessee courts take unlawful stops seriously. If the stop was not legally justified, the entire case against you may not hold up.

What Happens if Your Miranda Rights Were Not Read to You?

After you are arrested, officers must tell you about your Miranda rights before they question you. These rights include the right to stay silent and the right to have an attorney present. If an officer questioned you after your arrest without reading you those rights first, anything you said during that questioning may not be usable in court.

This does not always mean the entire case gets thrown out, but it can remove key evidence the prosecution was counting on. Combined with other challenges, a Miranda violation can seriously weaken the state's case.

How Can Field Sobriety Test Errors Help Your Defense?

Field sobriety tests have to be given according to specific standards set by the National Highway Traffic Safety Administration. If an officer did not follow those standards, the test results may not be valid.

Common errors include giving unclear instructions, running the test on uneven ground, not accounting for the driver's physical condition or footwear, and failing to document observations correctly at the time of the test. Even when tests are given the right way, things like nervousness, fatigue, medical conditions, and bad lighting can affect how someone performs. None of that has anything to do with alcohol.

Your attorney will look closely at how the field sobriety tests were done in your case.

Can Breath Test Problems Lead to a DUI Dismissal in Tennessee?

Breath test results are only reliable when the device is properly maintained, regularly calibrated, and used correctly by a certified officer.

Under Tennessee Code Annotated Section 55-10-408, breath test results can be challenged if the proper procedures were not followed. If the device was not calibrated on schedule, if the officer was not certified to use it, or if the required observation period before the test was not kept, the results may be thrown out. Tennessee law and court rules require the state to show proper testing procedures were followed.

Without a valid breath test result, the prosecution has to build its case on other evidence. That is a much harder thing to do.

What Is a Motion to Suppress and How Can It Help Your Case?

A motion to suppress is a legal request asking the court to keep certain evidence out of the case because it was gathered in a way that violated your rights. If your attorney finds a constitutional violation, like an illegal stop or an improper search, they can file this motion before trial.

If the court grants it, the prosecution cannot use that evidence. In DUI cases, removing the breath test result or the officer's observations can leave the state with very little to work with. In many cases, a successful suppression motion leads to a dismissal or a reduction in charges.

Schedule a Free Consultation With Our Oak Ridge, TN DUI Defense Attorney

Police mistakes happen, and when they do, they can make a difference in what happens to your case. You deserve an attorney who will dig into every detail and fight hard for the best possible result. Attorney Lance Baker is a Top 40 Under 40 attorney who brings sharp legal skills and a strong commitment to every client he represents. If you are facing a DUI charge, contact the Anderson County DUI defense lawyer at The Baker Law Firm by calling 865-200-4117 today.