Can You Get a DUI Under the Legal Limit in Tennessee?
Can You Get a DUI Under the Legal Limit in Tennessee?
True or False: You can’t get a DUI if you’re under the legal limit.
False. You can get a DUI in Tennessee even if your blood alcohol concentration (BAC) is below 0.08%. Tennessee law allows DUI charges based on impaired driving ability, not just a driver’s BAC. Being under the legal limit does not automatically mean you’re legally safe to drive.
Whether you’re heading to a University of Tennessee football game, tailgating with friends, or enjoying a night out in Knoxville, understanding how Tennessee’s DUI laws work can help you make safer decisions before getting behind the wheel.
Here’s what every Tennessee driver should know.
How Tennessee’s 0.08% DUI Limit Works
Most drivers know that 0.08% is the legal blood alcohol concentration (BAC) limit in Tennessee. What many don’t realize is that this number isn’t the only factor that can lead to a DUI charge.
Under Tennessee Code Annotated § 55-10-401, there are two primary ways a driver can be charged with DUI:
- Impairment-based DUI: A driver may be charged if alcohol, marijuana, drugs, or another substance impairs their ability to operate a vehicle safely, even when their BAC is below 0.08%.
- BAC-based DUI: A driver may be charged for operating a vehicle with a BAC of 0.08% or higher, regardless of whether they appear visibly impaired.
In other words, 0.08% is a legal threshold, not a guarantee that you’re safe to drive below it.
Alcohol can affect judgment, coordination, reaction time, and decision-making before a driver reaches that limit.
What Can Lead to a DUI Below 0.08%?
If a driver tests below the legal BAC limit, law enforcement may still investigate whether that person was impaired.
Officers may consider several factors when determining whether there is evidence of impaired driving.
Driving Behavior
An officer may notice behaviors such as:
- Weaving or drifting between lanes
- Braking unexpectedly
- Running a stop sign or traffic signal
- Driving at inconsistent speeds
- Making unsafe turns or other traffic violations
These behaviors may raise concerns about impairment, although they do not automatically establish that a driver is under the influence.
Physical Signs of Impairment
During a traffic stop, officers may also observe:
- Slurred speech
- Bloodshot or watery eyes
- Difficulty maintaining balance
- The odor of alcohol
- Trouble following instructions
Field Sobriety Tests
Law enforcement officers may use roadside field sobriety tests to assess possible impairment.
These tests can include walking in a straight line, standing on one leg, or following an object with your eyes.
However, performance on these tests can be affected by factors unrelated to alcohol, including fatigue, certain medical conditions, nervousness, footwear, and environmental conditions.
An officer’s observations may support a DUI investigation, but an arrest does not automatically mean a person will be convicted. The prosecution must still prove the elements of the offense.
Can You Get a DUI Without Actually Driving?
Yes, it’s possible.
Tennessee’s DUI law applies not only to people actively driving but also to those who are in physical control of a vehicle while impaired.
That distinction can be especially important after a night out or a long day of tailgating.
For example, someone who decides to sleep in a parked vehicle after drinking may still face questions about whether they were in physical control of that vehicle.
The circumstances matter, including factors such as:
- Where the person was sitting
- Where the vehicle was located
- Whether the engine was running
- Where the keys were located
- Whether the person had the ability to operate the vehicle
Simply being parked does not automatically eliminate the possibility of a DUI charge.
If you plan to drink, arranging a safe ride home in advance is a better option than relying on your vehicle as a place to wait.
DUI Laws Apply to More Than Alcohol
Another common misconception is that DUI charges only involve alcohol.
In Tennessee, DUI laws can also apply when a person’s ability to drive safely is impaired by substances such as:
- Marijuana
- Illegal drugs
- Certain prescription medications
- Over-the-counter medications that cause impairment
- Combinations of alcohol and other substances
Even if a medication is legally prescribed, it may still affect a person’s ability to drive.
Before operating a vehicle, pay attention to medication warnings and how a substance may affect your alertness, coordination, or reaction time.
How to Stay Safe on Knoxville Game Day
Game days in Knoxville bring thousands of fans together for football, tailgating, and celebrations across the city.
Whether you’re spending the afternoon near Neyland Stadium or meeting friends afterward, it’s important to remember that feeling fine doesn’t necessarily mean you’re safe to drive.
A few simple decisions can help keep you and others safe:
Plan your ride before you start drinking. Choose a designated driver, arrange a rideshare, or make other transportation plans ahead of time.
Don’t rely on how you feel. Alcohol affects people differently, and feeling alert doesn’t necessarily mean your driving ability is unaffected.
Be mindful of medications and other substances. Alcohol isn’t the only substance that can impair your ability to drive safely.
Look out for your friends. If someone in your group may be impaired, help them find a safe way home.
When in doubt, don’t drive. The safest decision is to avoid driving after drinking or using substances that could impair you.
A little planning before the game can make a big difference after the final whistle.
Frequently Asked Questions About Tennessee DUI Laws
- Can you get a DUI in Tennessee with a BAC below 0.08%?
Yes. Tennessee law allows DUI charges when alcohol or another substance impairs a person’s ability to drive safely, even if their BAC is below 0.08%.
- What is the legal alcohol limit in Tennessee?
For most drivers age 21 and older, Tennessee’s BAC limit is 0.08%. Commercial motor vehicle drivers are subject to a 0.04% threshold, and separate, stricter alcohol-related laws apply to drivers under 21.
- Can you get a DUI after only one or two drinks?
It’s possible. The number of drinks alone does not determine whether someone is legally impaired. Alcohol affects individuals differently, and Tennessee law allows impairment-based DUI charges without requiring a BAC of 0.08% or higher.
- Can you get a DUI while sitting in a parked car?
Potentially. Tennessee law includes being in physical control of a vehicle while impaired. Whether a parked-car situation meets that standard depends on the specific circumstances.
- Can prescription medication lead to a DUI?
Yes. A driver may face DUI charges if a prescription medication or another substance impairs their ability to operate a vehicle safely. Having a valid prescription does not automatically prevent a DUI charge.
- What happens if you’re charged with DUI in Tennessee?
A DUI charge can involve criminal proceedings and potential consequences such as fines, jail time, license revocation, and other requirements if convicted. The penalties depend on the circumstances of the case and any prior offenses.
An arrest is not the same as a conviction, and every case must be evaluated based on its individual facts.
Tennessee DUI Laws & Helpful Resources
For more information about Tennessee DUI laws, alcohol impairment, and responsible driving, explore these trusted resources:
Tennessee DUI Law – Tenn. Code Ann. § 55-10-401
Learn how Tennessee defines driving under the influence, including impairment-based DUI charges and the state’s blood alcohol concentration (BAC) limits.
Tennessee DUI Penalties – Tenn. Code Ann. § 55-10-402
Review Tennessee’s DUI laws, potential penalties, and the legal consequences of impaired driving.
National Highway Traffic Safety Administration (NHTSA) – Drunk Driving
Discover how alcohol affects judgment, coordination, and reaction time at different BAC levels, including levels below the legal limit.
Facing a DUI Charge in Tennessee?
Understanding Tennessee’s DUI laws is important, but knowing your options after an arrest matters, too.
A DUI charge can have serious consequences, even when a driver’s BAC is below the legal limit. The circumstances surrounding a traffic stop, the evidence collected, and the applicable law can all affect a case.
At Garza Law Firm, our criminal defense attorneys help individuals understand their legal options and navigate the challenges that can follow an arrest.
If you or someone you know has been charged with DUI in Knoxville or the surrounding East Tennessee area, contact Garza Law Firm to discuss your situation and learn more about your options.
This article is intended for general informational purposes only and does not constitute legal advice. Every case is different, and laws may change. Reading this article does not create an attorney-client relationship.