Tennessee treats a first DUI as a criminal misdemeanor with mandatory minimum penalties

A first driving under the influence (DUI) offense in Tennessee is classified as a Class B misdemeanor. This means you face jail time, fines, license suspension, and a permanent criminal record unless the charge is dismissed or reduced. Tennessee law does not offer a "wet reckless" plea or other reduced charge as an alternative to DUI — your options are conviction, acquittal, or dismissal.

The specific penalties depend on your blood alcohol content (BAC) at the time of arrest and whether anyone was injured. Even a first offense carries mandatory minimums that a judge cannot reduce, though a conviction can sometimes be expunged after a waiting period.

Key Takeaways

  • A first DUI in Tennessee is a Class B misdemeanor with a mandatory minimum of 48 hours in jail and a $350 fine, plus court costs.
  • Your driver's license is suspended for one year, and you must install an ignition interlock device on any vehicle you drive after six months.
  • You have the right to request a hearing with the Tennessee Department of Safety and Homeland Security within seven days of arrest to challenge the license suspension.
  • A conviction remains on your record permanently unless you later meet the requirements for expungement, which typically requires a waiting period and a petition to the court.
  • The prosecution must prove impairment beyond a reasonable doubt; a high BAC alone does not may provide conviction if the stop or arrest violated your rights.

Mandatory jail time and fines for a first DUI conviction

Tennessee law sets a mandatory minimum of 48 hours in jail for a first DUI conviction. The maximum sentence is 11 months and 29 days. A judge has discretion to impose any sentence within that range, but cannot go below 48 hours even for a first offense with no aggravating factors.

The mandatory fine is a minimum of $350 and a maximum of $1,500, plus court costs. Court costs vary by county but typically range from $150 to $400. If you cannot afford the fine, the court may allow you to pay in installments or perform community service in lieu of payment, though this is at the judge's discretion.

If your BAC was 0.20 or higher at the time of arrest, the penalties increase: minimum jail time becomes 7 days, and the minimum fine becomes $600. If anyone was injured or killed, the charge may be elevated to a felony, which carries much longer prison sentences.

Driver's license suspension and ignition interlock requirements

Your driver's license is suspended for one year following a first DUI conviction in Tennessee. This suspension is separate from any jail sentence and begins on the date of conviction. During this time, you cannot legally drive any vehicle, even with a restricted license.

After six months of suspension, you may install an ignition interlock device (IID) on your vehicle and request a restricted license that allows you to drive to work, school, medical appointments, and court-ordered programs. The IID requires you to blow into a breathalyzer before the engine starts and at random intervals while driving. You pay for the device installation and monthly monitoring, which typically costs $60 to $100 per month.

If you are convicted a second time within ten years, the IID requirement extends to three years. You must maintain the device for the full period; removing it or tampering with it is a separate criminal offense.

Administrative license suspension versus criminal conviction

Tennessee has two separate suspension processes: the administrative suspension and the criminal suspension. The administrative suspension happens when ready after arrest if you failed or refused a breath or blood test. This suspension is imposed by the Department of Safety and Homeland Security, not by the court, and you can challenge it.

You have seven days from the date of arrest to request an administrative hearing. If you do not request a hearing within seven days, the administrative suspension becomes effective and lasts for one year (or two years if you refused the test). If you request a hearing and lose, the suspension still applies. If you win the hearing, the administrative suspension is lifted, but you may still face a criminal suspension if you are convicted in court.

The criminal suspension is imposed by the judge as part of sentencing and runs concurrently with or after the administrative suspension, depending on timing. Many people face both suspensions running at the same time, effectively extending the total suspension period.

How the prosecution must prove impairment in court

The state must prove beyond a reasonable doubt that you were impaired by alcohol or drugs. A high BAC is strong evidence of impairment, but it is not the only way the prosecution can prove guilt. The prosecution may also present testimony from the arresting officer about your appearance, speech, balance, and performance on field sobriety tests.

Field sobriety tests — the horizontal gaze nystagmus (HGN), one-leg stand, and walk-and-turn — are not chemical tests and have known error rates. Your attorney can challenge the administration of these tests, the officer's training, and whether the results were properly documented. If the officer did not follow standardized procedures, the results may be excluded from evidence.

The prosecution must also establish a proper chain of custody for any breath or blood sample and show that the testing equipment was properly calibrated and maintained. If the breath test machine was not certified or the blood sample was mishandled, the results may be inadmissible. Many first-time DUI cases are reduced or dismissed because of defects in the evidence or the traffic stop itself.

Your rights during the arrest and testing process

You have the right to refuse a breath or blood test, but Tennessee has an "implied consent" law. By driving on Tennessee roads, you are deemed to have consented to chemical testing if arrested for DUI. Refusing the test does not prevent prosecution — it only means the state cannot use a BAC result against you in court. However, the refusal itself can be used as evidence of consciousness of guilt, and the administrative suspension is longer (two years instead of one) if you refuse.

You have the right to speak with an attorney before deciding whether to take the test, but the officer is not required to delay the test while you consult a lawyer. You also have the right to request an independent blood test at your own expense if the state's test is performed. This independent test can be used to challenge the state's results if they differ significantly.

If the officer did not have reasonable suspicion to stop your vehicle or probable cause to arrest you, any evidence obtained after an unlawful stop or arrest may be excluded from trial. This is a common defense strategy and requires careful review of the police report, dashcam footage, and any other evidence of what happened before and during the stop.

Expungement and criminal record consequences

A DUI conviction in Tennessee remains on your criminal record permanently unless you petition the court for expungement. Expungement is not automatic and requires you to meet specific conditions. For a first DUI, you must wait a minimum of five years from the date of conviction before you can petition for expungement.

The court will consider factors such as your behavior since the conviction, whether you have completed all court-ordered programs, and whether expungement is in the interests of justice. Even if expungement is granted, the record is not erased — it is sealed and hidden from most background checks, but law enforcement and certain government agencies can still access it.

A DUI conviction can affect employment, housing, professional licenses, insurance rates, and child custody decisions. Some employers conduct background checks and will not hire someone with a DUI. Insurance companies typically raise rates significantly or may refuse to insure you. If you are explore for a professional license (nursing, law, teaching), you must disclose the conviction and the licensing board may deny your process.

Frequently Asked Questions

Can I get a DUI charge dismissed before trial?

Yes. The prosecution may dismiss the charge if evidence is weak or inadmissible, or you and the prosecution may reach a plea agreement. Some charges are dismissed because the traffic stop was unlawful, the breath test was improperly administered, or the officer lacked probable cause. Your attorney can file motions to suppress evidence or request discovery to identify weaknesses in the state's case.

What is the difference between a DUI and a DWI in Tennessee?

Tennessee uses only the term DUI (driving under the influence). There is no separate DWI charge. DUI covers impairment by alcohol, prescription drugs, illegal drugs, or any combination. The charge applies regardless of which substance caused the impairment.

Do I have to take a breath test at the police station?

You can refuse, but the refusal has consequences. The administrative suspension is two years instead of one, and the refusal can be used as evidence at trial. You do have the right to request an independent blood test at your own expense if you take the state's test.

How much does a DUI cost in Tennessee?

Costs vary by county and case, but typically include a $350 to $1,500 fine, court costs of $150 to $400, attorney fees of $1,500 to $5,000 or more, ignition interlock device costs of $60 to $100 per month, and increased insurance premiums. Total out-of-pocket costs often exceed $3,000 to $5,000 over the first year.

Can I get my license back before the one-year suspension ends?

Yes, after six months you can install an ignition interlock device and request a restricted license. The restricted license allows driving to work, school, medical appointments, and court-ordered programs only. You must maintain the device for the remainder of the suspension period.