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DUI License Revocation, Implied Consent and Ignition Interlock in Tennessee

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Short answer: a Tennessee DUI arrest opens two cases. The criminal charge and the implied-consent charge are both decided in court, the refusal on its own warrant and often at your first appearance. Refusing the test has its own revocation under the implied-consent law, a conviction brings a one-year revocation on a first offense, and getting back on the road usually means a restricted license with an ignition interlock.

This page is the detail behind our Memphis DUI lawyer page, on the license side of a DUI arrest. Call (901) 324-5000, or call or text the criminal line at 901-412-2973, any time. Se habla español.

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. Since January 1, 2026, a refused blood test by a driver with no prior conviction who is suspected of misdemeanor DUI carries 18 months; from January 1, 2027, every first refusal carries 18 months.
  • Refusal with a prior conviction (DUI, vehicular assault or vehicular homicide, including out-of-state equivalents): 2-year revocation. A prior refusal is not a prior conviction; a prior implied-consent violation within five years makes the new revocation run consecutive to the DUI revocation and makes an ignition interlock mandatory on any restricted license.
  • Refusal after a crash in which someone suffered serious bodily injury: 2-year revocation.
  • Refusal after a crash in which someone was killed: 5-year revocation.
  • Refusal when a passenger is under 18, 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 license revocation even if you are ultimately acquitted of the underlying DUI. It is charged on a separate warrant, found by the court rather than by an agency, and runs independent of the criminal case.

Two further changes took effect May 5, 2025 under SB 1400 (2025 Public Chapter 403). A refusal can now be charged even when the State obtains the sample anyway — by search warrant, court order, exigent circumstances, or other lawful means — so refusing no longer denies the State its evidence for free. And oral fluid (saliva) testing is now authorized with consent, a warrant, incident to a lawful arrest or in exigent circumstances, though refusing a saliva test is not an implied-consent violation; it matters most in drugged-driving cases, where collection procedure, officer training, and the reliability of the test are all open to challenge.

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.

Two Parallel Tracks: Criminal Court and the Tennessee Department of Safety

A Tennessee DUI arrest with a refusal sets two charges in motion, both in court. The DUI is prosecuted by the District Attorney in General Sessions, Criminal, or Municipal Court. The implied-consent violation is charged on a separate warrant or citation and found by the court, on the State’s motion when the DUI is resolved or, failing that, at your first appearance or preliminary hearing. The Tennessee Department of Safety and Homeland Security (TDOSHS) does not hold a hearing on the refusal; it records the revocation the court orders, and it controls reinstatement, SR-22 filings, points and interlock compliance. An outcome on one charge does not automatically dictate the result on the other.

Different Burdens, Same Court

In criminal court, the prosecution must prove every element of the DUI beyond a reasonable doubt to a judge or jury. The implied-consent violation is decided by the court on the separate warrant, and the question is narrower: whether you were under arrest, whether the officer had probable cause and asked for the test, whether you were advised of the consequences, and whether you refused. If the officer did not give the advisement, the court has no authority to suspend your license for the refusal (T.C.A. § 55-10-406(d)(3)).

You can be acquitted of DUI and still lose your license on the refusal. The implied-consent revocation under T.C.A. §§ 55-10-406 and 55-10-407 is a civil consequence, found by the court on its own warrant, and the DUI verdict does not automatically undo it. One exception: if the license was revoked for the refusal before the DUI was resolved, and the DUI is then dismissed because the officer lacked sufficient cause for the stop, the court may order the license reinstated. This is why the refusal has to be defended on its own, even when the criminal case looks strong.

The Refusal Is Decided Early

The refusal is not decided on a deadline measured from a notice; it is decided in court, and often early. Under T.C.A. § 55-10-406(d)(4), the court rules on the refusal when the DUI is disposed of, on the State’s motion, or otherwise at your first appearance or preliminary hearing in General Sessions, and no later than bind-over to the grand jury. A refusal that goes unchallenged at that stage is lost by default, and a successful criminal defense months later will not undo it. Raise it with a lawyer immediately after arrest.

What the Department of Safety Controls

  • Issuing the restricted license. A restricted license during a DUI or refusal revocation is ordered by the court under T.C.A. § 55-10-409; the Department issues it once the order, the SR-22 and any interlock are in place.
  • Reinstatement. Even after you have served every day of your sentence and paid every dollar of your fines, your license stays revoked until the Department processes a reinstatement application, collects the $103 reinstatement fee, an SR-22 fee, and a $75 surrender fee if applicable, and verifies all compliance documents.
  • SR-22 insurance filings are tracked by the Department’s Financial Responsibility Division. A lapse in your SR-22 — even years into the revocation period — triggers a fresh suspension.
  • Out-of-state convictions and reciprocity. When another state notifies Tennessee of a revocation, the Department sends a 30-day notice and, absent clearance or a timely hearing request, cancels your Tennessee license under T.C.A. § 55-50-902.
  • Ignition interlock compliance. The interlock reporting agency forwards monthly data directly to the Department’s monitoring division. A “violation” finding by the Department can reset your 120-day compliance clock under T.C.A. § 55-10-425 even if no court hearing was held.
  • Points and accumulation suspensions that have nothing to do with the criminal case but can run concurrently with a DUI revocation.

Appeals: Court Rulings and Department Decisions

The refusal finding is a court ruling and is reviewed through the courts like the rest of the case. An adverse Department of Safety decision of its own — a points suspension, a financial-responsibility suspension, an interlock violation finding — is appealed not to the criminal court but to Chancery Court for judicial review under the Uniform Administrative Procedures Act. The reviewing chancellor does not retry the case — review is generally limited to whether the agency’s decision was supported by substantial and material evidence, was within the agency’s authority, and was not arbitrary or capricious.

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 (T.C.A. § 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. The same court-order route applies to a refusal revocation: T.C.A. § 55-10-409 lets the court grant a restricted license during an implied-consent revocation, with an interlock mandatory where you have a qualifying prior within five years.

Talk to a Memphis DUI lawyer

Patrick Brooks handles every DUI case personally in Shelby County General Sessions, the Germantown, Bartlett and Collierville municipal courts, and Tipton and Fayette County. A first-offense DUI starts at $2,500, flat; the schedule is on what a DUI lawyer costs in Memphis. Call (901) 324-5000, or call or text the criminal line at 901-412-2973, any time. Se habla español.

Frequently asked questions

When is the refusal decided?

Early, and in court. The implied-consent violation is charged on its own warrant and ruled on by the court when the DUI is resolved or, failing that, at your first appearance or preliminary hearing in General Sessions. There is no separate agency hearing to request and no notice-based deadline, but a refusal left unchallenged at that first setting is lost. Call before you do anything else.

If I win the criminal case, do I get my license back automatically?

No. The implied-consent revocation is independent of the DUI charge. An acquittal on the DUI does not undo a refusal finding that was never contested, except that a DUI dismissed for lack of sufficient cause for the stop lets the court order the license reinstated.

Can I drive to work during a revocation?

Often, on a restricted license, and in most cases with an ignition interlock installed. The court order is presented to the Department of Safety, which issues the restricted license once the interlock is in place.