DUI Defense in Memphis, Tennessee

Tennessee DUI defense information from Brooks Law Firm in Memphis — penalties by offense number, implied consent law, field sobriety tests, breathalyzer science, ignition interlock requirements, and aggravating factors. Updated with 2024 TCA citations.

A DUI arrest in Tennessee is serious. Even a first offense carries mandatory jail time, a one-year loss of your driver’s license, and fines and court costs that can exceed $4,000 before you ever pay an attorney. A conviction stays on your record permanently — it cannot be expunged in Tennessee. If you have been charged with driving under the influence in Shelby County or anywhere in the Mid-South, the decisions you make in the first days after your arrest will shape the rest of the case. Call Brooks Law Firm at (901) 324-5000 for a confidential consultation.

What Tennessee Law Actually Prohibits

Under T.C.A. § 55-10-401, it is unlawful for any person to drive or be in physical control of a motor vehicle on any public road, highway, street, alley, or on the premises of a shopping center, trailer park, or apartment complex while:

  • Under the influence of any intoxicant, marijuana, controlled substance, drug, substance affecting the central nervous system, or any combination of these, that impairs the driver’s ability to safely operate the vehicle; or
  • The alcohol concentration in the driver’s blood or breath is 0.08% or more.

Two important points that often surprise clients:

  • You do not have to be driving. “Physical control” is enough. Sitting in the driver’s seat with the keys — even with the engine off — has supported DUI convictions in Tennessee.
  • You do not have to blow over 0.08. If an officer believes your ability to drive is impaired by alcohol, prescription medication, marijuana, or any combination, you can be charged regardless of your BAC.

Penalties by Offense Number

Tennessee’s DUI penalty structure escalates sharply with each prior conviction. The lookback period is ten years — any DUI conviction within the past decade counts as a prior for enhancement purposes under T.C.A. § 55-10-405. Below are the statutory minimums set by T.C.A. §§ 55-10-402 and 55-10-403.

First Offense

  • Jail: Not less than 48 hours, up to 11 months and 29 days. Minimum increases to 7 consecutive days if your BAC was 0.20% or higher.
  • Fine: $350 to $1,500.
  • License revocation: 1 year.
  • Required: DUI School, alcohol and drug assessment, 24 hours of roadside litter removal as a condition of probation, and possible ignition interlock.
  • Additional fees: $250 BADT fee (T.C.A. § 55-10-413(f)), $100 alcohol and drug addiction treatment fee, plus court costs.

Second Offense

  • Jail: Not less than 45 consecutive days, up to 11 months and 29 days.
  • Fine: $600 to $3,500.
  • License revocation: 2 years.
  • Ignition interlock: Required during any restricted-license period and for a period after reinstatement.
  • Vehicle forfeiture: The vehicle used in the offense may be seized and forfeited under T.C.A. § 55-10-414.

Third Offense

  • Jail: Not less than 120 consecutive days, up to 11 months and 29 days.
  • Fine: $1,100 to $10,000.
  • License revocation: 6 years.
  • Ignition interlock required; vehicle forfeiture applies.

Fourth or Subsequent Offense — Felony

  • Classification: Class E felony.
  • Jail: Not less than 150 consecutive days, served day-for-day, up to the maximum for the applicable Class E felony range.
  • Fine: $3,000 to $15,000.
  • License revocation: 8 years.
  • A felony DUI carries lifetime collateral consequences — loss of firearm rights, voting rights until restored, and substantial employment and immigration consequences.

Sixth or Subsequent Offense

A sixth or subsequent DUI is a Class C felony under T.C.A. § 55-10-402(a)(6), carrying 3 to 15 years in the Department of Correction and fines up to $15,000.

Aggravating Factors That Enhance Your Sentence

DUI crash

DUI with a Child in the Vehicle

Under T.C.A. § 55-10-402(e), driving under the influence with a passenger under 18 years old adds a mandatory 30 days of incarceration on top of the base DUI sentence, plus an additional $1,000 fine under T.C.A. § 55-10-403(a)(5). If the child suffers serious bodily injury, the offense becomes a Class D felony; if the child dies, it becomes a Class B felony.

DUI Resulting in Injury — Vehicular Assault

If a DUI causes serious bodily injury to another person, the charge is upgraded to Vehicular Assault under T.C.A. § 39-13-106 — a Class D felony. Aggravated Vehicular Assault under T.C.A. § 39-13-115 is a Class C felony when the defendant has prior DUI or vehicular offenses, or certain BAC thresholds are met.

DUI Resulting in Death — Vehicular Homicide

Vehicular Homicide by intoxication under T.C.A. § 39-13-213(a)(2) is a Class B felony carrying 8 to 30 years. Aggravated Vehicular Homicide under T.C.A. § 39-13-218 — involving prior DUI convictions, a BAC of 0.20% or higher combined with a prior DUI, or prior vehicular offenses — is a Class A felony carrying 15 to 60 years.

High BAC (0.20% or Higher)

A first-offense DUI with a BAC of 0.20% or greater carries an enhanced mandatory minimum of 7 consecutive days in jail instead of the baseline 48 hours.

Implied Consent and License Revocation

When you applied for your Tennessee driver’s license, you consented in advance to chemical testing of your blood or breath any time a law enforcement officer has reasonable grounds to believe you are driving under the influence. This is Tennessee’s implied consent law, codified at T.C.A. § 55-10-406.

Consequences of Refusal

Refusing a lawful chemical test carries its own penalties, separate from the DUI charge itself:

  • First refusal: 1-year license revocation.
  • Second refusal (or first refusal with a prior DUI): 2-year revocation.
  • Refusal with a prior vehicular assault or homicide conviction: 5-year revocation.
  • Refusal when a passenger is under 16, or when a crash caused injury or death: The officer is statutorily required to obtain a blood sample with or without your consent, pursuant to T.C.A. § 55-10-406(c).

Refusal is a civil violation, not a crime — but it results in automatic license revocation even if you are ultimately acquitted of the underlying DUI. The revocation begins at the time of the arrest notice and runs independent of the criminal case.

When the State Can Test You Anyway

Under current Tennessee law, officers must either obtain your consent, obtain a search warrant, or demonstrate exigent circumstances before drawing blood. However, T.C.A. § 55-10-406(c) requires blood testing — with or without consent, with a warrant or under exigent circumstances — whenever:

  • The driver was in a crash causing injury or death to another;
  • A passenger in the vehicle was under 18; or
  • The driver has a prior conviction for DUI, vehicular assault, aggravated vehicular assault, vehicular homicide, or aggravated vehicular homicide.

Field Sobriety Tests and Breathalyzers — What the Science Actually Shows

Standardized Field Sobriety Tests (SFSTs)

The three tests validated by the National Highway Traffic Safety Administration (NHTSA) are the Horizontal Gaze Nystagmus (HGN), the Walk-and-Turn, and the One-Leg Stand. Officers and prosecutors present these as objective measures of impairment. They are not.

  • NHTSA’s own validation studies pegged combined accuracy at roughly 91% — but only when administered on a dry, level, well-lit surface to a subject with no medical conditions, no footwear issues, no inner-ear problems, and not more than 50 pounds overweight. Roadside conditions rarely match.
  • HGN can be influenced by caffeine, nicotine, prescription medications, head trauma, certain neurological conditions, and even the flashing lights on the patrol car behind you.
  • Walk-and-Turn and One-Leg Stand are designed so the average sober person is expected to make at least one “clue” the officer is trained to score against you. A single clue on the Walk-and-Turn is not a fail; two clues out of eight possible scoring categories can be enough for the officer to report failure.

These tests are voluntary in Tennessee. You cannot be punished for declining them — unlike chemical tests, which trigger implied-consent revocation if refused.

Breath Testing

Tennessee uses the Intoximeter EC/IR II as its evidential breath testing instrument. The device does not measure alcohol directly — it infers blood alcohol by measuring alcohol in expired breath and applying a population-average ratio of 2,100:1. Your actual blood-to-breath ratio may be significantly different, which can skew results up or down.

Common issues that a defense attorney will examine:

  • 20-minute observation period. The officer is required to observe you continuously for at least 20 minutes before the test — no belching, burping, regurgitation, or putting anything in your mouth. Failure to document this period can compromise the result.
  • Instrument certification and calibration records under the Tennessee Bureau of Investigation’s protocols.
  • Mouth alcohol from dental work, recent alcohol consumption, GERD, or acid reflux can produce artificially elevated readings.
  • Interfering substances — certain industrial exposures, ketones (in diabetics or low-carb dieters), and some inhalers can trigger false positives.
  • Rising blood alcohol curve. If you drank shortly before driving, your BAC at the time of the test may be significantly higher than at the time you were behind the wheel — a defense worth investigating when the arrest-to-test interval is long.

Blood Testing

Blood tests are presumed more accurate than breath but are not beyond challenge. Chain of custody, storage conditions, the sterilant used on the draw site (alcohol-based swabs should never be used), gas chromatography calibration, and analyst qualifications are all proper subjects for cross-examination and motions to suppress.

Ignition Interlock and Restricted License

A Tennessee DUI conviction triggers automatic license revocation. You may, however, be eligible for a restricted license under T.C.A. § 55-10-409 that allows you to drive for specified purposes — work, school, court-ordered programs, medical appointments — during the revocation period.

When an Ignition Interlock Device (IID) is Required

Under T.C.A. §§ 55-10-409 and 55-10-417, an IID is required — not optional — in any of the following situations:

  • A first DUI with BAC of 0.08% or higher if you want a restricted license (TCA 55-10-409(b)(2)(B));
  • Any DUI with a prior DUI or § 55-10-421 conviction within the past 10 years;
  • Any DUI where a child under 18 was a passenger;
  • Any second or subsequent DUI;
  • Any DUI arising from a crash with injury.

How the Device Works

An IID is a breath-alcohol analyzer wired into the vehicle’s starter circuit. The vehicle will not start if your breath alcohol exceeds 0.02%. The device also requires random “rolling retests” while you are driving. Every test is photographed and logged; the data is reported to the state monitoring agency every 30 days.

Compliance-Based Removal

Under T.C.A. § 55-10-425, the interlock period is the longer of 365 consecutive days or the full period of license revocation. To have the device removed at the end of that period, you must complete the final 120 days violation-free — meaning no failed start attempts above 0.02%, no skipped rolling retests, and no attempts to tamper with or circumvent the device. Any violation in that final 120-day window resets the clock.

Costs You Should Expect

  • Installation: typically $70–$150.
  • Monthly monitoring/calibration: roughly $60–$100 per month.
  • $12 one-time electronic monitoring fee under T.C.A. § 55-10-417(m).
  • Removal fee when the period ends.
  • Indigent drivers may qualify for assistance through the Electronic Monitoring Indigency Fund under T.C.A. § 55-10-419.

Applying for the Restricted License

The court order for a restricted license must be presented to a Tennessee Driver Service Center within 10 days of issuance, along with proof of SR-22 insurance, a $65 license fee, and a $2 application fee. The court order itself serves as a 10-day temporary restricted license; a hard copy is mailed after your visit to the Service Center.

Why the First Week After an Arrest Matters Most

Evidence disappears quickly. Patrol-car dash-cam and body-cam footage is frequently overwritten within 30 to 90 days if no preservation request is made. Surveillance footage from a bar, restaurant, or parking lot where the stop originated is typically overwritten in 7 to 14 days. Witness recollections fade. Breath and blood testing instruments have calibration records that are time-sensitive.

The sooner a defense attorney is retained, the more of this evidence can be preserved through formal requests and subpoenas. This is why same-day or next-day consultation matters in a DUI case more than in most other criminal matters.

How Brooks Law Firm Defends DUI Cases

Every DUI case turns on three questions: Was the stop lawful? Was the arrest supported by probable cause? And is the chemical or observational evidence of impairment admissible and reliable? Our defense work examines every link in the chain:

  • The stop itself: Did the officer have reasonable suspicion of a traffic violation or criminal activity? Was the stop unduly prolonged in violation of Rodriguez v. United States?
  • The arrest: Were the SFSTs properly administered? Did the officer follow NHTSA protocols? Were the conditions — weather, surface, lighting — suitable for a valid test?
  • The chemical evidence: Did the officer observe the required 20-minute period? Was the instrument certified? Are the calibration and maintenance records complete? Was the blood draw handled by a qualified technician using proper materials?
  • The implied consent: Was the implied consent warning read correctly and completely? Was any refusal actually a refusal, or a confused response to an ambiguous advisement?
  • Prior convictions: For an enhanced charge, the state must prove the prior conviction was constitutionally obtained. We review predicate convictions for validity.

Not every DUI case ends in trial. A motion to suppress the stop, the SFSTs, or the chemical test can force a reduction to reckless driving or a dismissal. Judicial diversion, while unavailable for DUI under T.C.A. § 40-35-313(a)(1)(B)(ii), may be available for lesser included offenses negotiated as part of a plea. Our job is to find the strongest argument your facts support and pursue it.

What to Do Right Now If You’ve Been Arrested

  1. Write down everything you remember while it’s fresh — what you ate and drank, when, where, who was with you, what the officer said, what tests were administered, and how you felt physically.
  2. Do not post about the arrest on social media. Prosecutors check.
  3. Preserve any receipts from bars, restaurants, or stores you visited before the arrest.
  4. Do not contact the arresting officer or the prosecutor directly. Any statement can be used against you.
  5. Request a hearing on your license revocation. You have limited time to challenge the implied-consent revocation — do not miss this window.
  6. Call Brooks Law Firm at (901) 324-5000 for a consultation before your arraignment.

Schedule a Confidential Consultation

Brooks Law Firm represents clients charged with DUI throughout Shelby County — in General Sessions, Criminal Court, and Municipal Court — and in surrounding West Tennessee counties. We offer Spanish-language services. Consultations are confidential and without obligation.

Brooks Law Firm
2299 Union Avenue
Memphis, Tennessee 38104
Phone: (901) 324-5000
patrickbrookslaw.com/

Disclaimer: This page provides general information about Tennessee DUI law current as of 2024 and is not legal advice. Reading this page does not create an attorney-client relationship. Statutory citations reflect the 2024 Tennessee Code; amendments after that date may affect the accuracy of specific provisions. Every case is different. If you have been charged with a DUI, contact a qualified Tennessee attorney about the specific facts of your matter.