Every weekend in Memphis, law enforcement agencies across Shelby County set up DUI checkpoints, deploy saturation patrols, and conduct targeted enforcement operations designed to catch impaired drivers. The Memphis Police Department, Shelby County Sheriff's Office, Tennessee Highway Patrol, and suburban departments in Germantown, Bartlett, Collierville, and Arlington are all actively enforcing Tennessee's DUI laws — and they are making arrests. In 2023 alone, thousands of DUI arrests were made across Shelby County, with charges filed in Memphis City Court, Shelby County General Sessions Court, and Criminal Court.
If you've been charged with driving under the influence in Memphis or anywhere in Shelby County, the consequences you face are severe. Tennessee's DUI laws are among the toughest in the Southeast, and a conviction can affect every aspect of your life for years to come. Here is what you need to know.
Tennessee DUI Legal Limits: Know the Numbers
Under Tennessee Code Annotated Section 55-10-401, it is illegal to operate a motor vehicle in Tennessee while under the influence of any intoxicant, marijuana, controlled substance, drug, or combination thereof that impairs your ability to drive safely. Tennessee law establishes the following blood alcohol concentration (BAC) limits:
- 0.08% BAC — The legal limit for drivers 21 and older operating a standard passenger vehicle
- 0.04% BAC — The legal limit for commercial vehicle drivers (CDL holders), including truck drivers on I-40 and I-55
- 0.02% BAC — The zero-tolerance limit for drivers under 21 years of age
It is important to understand that you can be arrested and convicted of DUI in Tennessee even if your BAC is below 0.08%. If an officer observes signs of impairment — swerving on Poplar Avenue, failing field sobriety tests on Beale Street, or exhibiting slurred speech at a checkpoint on Germantown Parkway — you can be charged with DUI based on the officer's observations alone.
Tennessee's Implied Consent Law
Under Tennessee Code Annotated Section 55-10-406, every person who drives a motor vehicle in Tennessee has given their implied consent to submit to a chemical test (blood, breath, or urine) to determine their BAC if they are lawfully arrested for DUI. This means that by obtaining a Tennessee driver's license and driving on Tennessee roads, you have already agreed to be tested if an officer has probable cause to arrest you for DUI.
Refusing a chemical test triggers automatic consequences under Tennessee's implied consent law, separate from and in addition to any DUI penalties. We'll discuss what happens if you refuse below.
What Happens When You're Pulled Over for DUI in Memphis
A typical DUI stop in Memphis follows a predictable pattern. Understanding this process can help you protect your rights:
- The traffic stop: An officer needs reasonable suspicion to pull you over — swerving, running a red light, speeding, expired tags, or a traffic violation on roads like Walnut Grove, Union Avenue, or I-240.
- Initial observation: The officer approaches your vehicle, looking for signs of impairment: bloodshot eyes, slurred speech, the smell of alcohol, open containers.
- Field sobriety tests (FSTs): If the officer suspects impairment, they will ask you to perform standardized field sobriety tests — the Horizontal Gaze Nystagmus (HGN) test, the Walk-and-Turn test, and the One-Leg Stand test. These tests are voluntary in Tennessee, though officers rarely inform you of that fact.
- Preliminary breath test (PBT): A portable breathalyzer may be used at the scene. Results from portable devices are generally not admissible in court in Tennessee but can support the officer's probable cause determination.
- Arrest: If the officer determines probable cause exists, you will be arrested and transported to the Shelby County Jail at 201 Poplar Avenue or to a local precinct.
- Chemical testing: At the station, you will be asked to submit to a formal breath test (using a calibrated Intoxilyzer) or a blood draw. This is the test covered by implied consent law.
First Offense DUI Penalties in Tennessee
Even a first-offense DUI in Tennessee carries mandatory minimum penalties that cannot be waived by the judge. Under TCA Section 55-10-403, a first DUI conviction results in:
- Jail time: A mandatory minimum of 48 hours in jail (168 hours / 7 days minimum if your BAC was 0.20% or higher)
- Fines: $350 to $1,500 in fines, plus court costs and fees that can push the total well over $2,000
- License revocation: Your driver's license will be revoked for one year
- Alcohol and drug treatment: Mandatory completion of an alcohol and drug treatment program approved by the Tennessee Department of Mental Health
- Ignition interlock device: You may be required to install an ignition interlock device (IID) on your vehicle at your own expense
- Probation: Up to 11 months and 29 days of probation
- Community service: A minimum of 24 hours of community service (or financial contribution in lieu)
Second Offense and Subsequent DUI Penalties
Penalties increase dramatically with each subsequent DUI conviction in Tennessee:
Second Offense DUI
- Mandatory minimum 45 days in jail (up to 11 months and 29 days)
- Fines of $600 to $3,500
- Two-year license revocation
- Vehicle forfeiture or seizure
- Mandatory ignition interlock device
Third Offense DUI
- Mandatory minimum 120 days in jail (up to 11 months and 29 days)
- Fines of $1,100 to $10,000
- Six-year license revocation
- Vehicle forfeiture
- Classified as a Class A misdemeanor
Fourth and Subsequent Offenses
- Classified as a Class E felony
- Mandatory minimum 150 consecutive days in jail (up to six years in state prison)
- Fines of $3,000 to $15,000
- Eight-year license revocation
Aggravated DUI Charges in Tennessee
Certain circumstances can elevate DUI charges and increase penalties significantly. Aggravating factors under Tennessee law include:
- DUI with a child passenger: Having a minor under 18 in the vehicle during a DUI is a separate offense carrying mandatory minimum jail time and enhanced penalties
- DUI causing injury or death: If your impaired driving causes serious bodily injury, you face felony charges — vehicular assault (Class D felony) or vehicular homicide (Class B felony), which carries 8 to 30 years in prison
- DUI with a BAC of 0.20% or higher: Triggers enhanced mandatory minimum jail time even on a first offense
- DUI in a school zone: Enhanced penalties apply when a DUI occurs within a designated school zone in Memphis or Shelby County
- DUI with a prior vehicular assault or homicide conviction: Subjects the defendant to additional mandatory minimum sentencing
DUI Checkpoints in Memphis — Are They Legal?
Yes, DUI checkpoints are legal in Tennessee. The Tennessee Supreme Court has upheld the constitutionality of sobriety checkpoints, provided they meet certain requirements established under both the U.S. and Tennessee Constitutions. Memphis-area law enforcement agencies regularly set up checkpoints on weekends and around holidays, particularly along corridors known for nightlife activity — Beale Street, Cooper-Young, Overton Square, and Germantown Parkway near Wolfchase.
However, checkpoints must follow specific guidelines to be constitutional:
- The checkpoint must be authorized by a supervisory officer, not individual patrol officers
- The location and time must be selected based on data about DUI-related accidents in the area
- The checkpoint must follow a predetermined, neutral formula for stopping vehicles (e.g., every third car)
- Adequate signage and lighting must be present to alert approaching drivers
- The detention of each driver must be brief and minimally intrusive
If a checkpoint does not follow these rules, your DUI defense attorney may be able to challenge the legality of the stop and suppress all evidence obtained as a result.
Can You Refuse a Breathalyzer in Tennessee?
This is one of the most common questions Memphis drivers ask, and the answer has two parts:
Portable breathalyzer at the scene (PBT): You can refuse this test without any legal penalty. The portable test results are not admissible in Tennessee courts anyway.
Formal chemical test at the station (Intoxilyzer or blood draw): You can technically refuse, but doing so triggers Tennessee's implied consent penalties — an automatic one-year license revocation for a first refusal, independent of any DUI conviction. The refusal can also be used against you as evidence at trial. And in cases involving accidents with injuries or fatalities, Tennessee law now permits officers to obtain a search warrant for a mandatory blood draw, meaning your refusal may not prevent testing anyway.
Common DUI Defense Strategies
A DUI charge is not a DUI conviction. An experienced Memphis criminal defense attorney has many potential strategies to challenge the prosecution's case:
- Challenging the traffic stop: If the officer lacked reasonable suspicion to pull you over, all evidence obtained after the stop may be suppressed
- Challenging field sobriety tests: FSTs are subjective and can be affected by medical conditions, footwear, road surface, weather, anxiety, and the officer's administration of the tests
- Challenging breathalyzer accuracy: Intoxilyzer machines must be properly calibrated and maintained. Operator error, machine malfunction, and environmental factors can produce inaccurate results
- Challenging blood test procedures: Blood samples must be drawn by qualified personnel, properly stored, and processed according to strict chain-of-custody protocols. Violations can render results inadmissible
- Rising BAC defense: Your BAC may have been below the legal limit while you were actually driving but rose above 0.08% by the time the test was administered at the station
- Medical conditions: GERD (acid reflux), diabetes, certain diets, and other medical conditions can cause falsely elevated breathalyzer readings
- Checkpoint violations: If you were stopped at an improperly conducted DUI checkpoint, the entire stop may be unconstitutional
How a Memphis DUI Conviction Affects Your Life
Beyond the criminal penalties of jail time and fines, a DUI conviction in Shelby County has far-reaching consequences that many people don't consider until it's too late:
- Employment: A DUI conviction appears on background checks and can disqualify you from many jobs, particularly those requiring driving, security clearances, or professional licenses
- Auto insurance: Your insurance premiums will increase dramatically — often doubling or tripling — and you may be required to carry SR-22 insurance for years
- Commercial driver's license (CDL): A single DUI conviction results in a one-year CDL disqualification. A second DUI means a lifetime CDL ban. For Memphis drivers who work in the trucking and logistics industry, this can end a career
- Professional licenses: Nurses, doctors, lawyers, teachers, real estate agents, and other licensed professionals may face disciplinary action from their licensing boards
- Housing: Landlords frequently run criminal background checks, and a DUI can make it harder to rent an apartment in Memphis
- Immigration consequences: For non-citizens, a DUI conviction can trigger deportation proceedings or disqualify you from obtaining a visa or green card
- Criminal record: DUI convictions cannot be expunged in Tennessee. The conviction remains on your criminal record permanently
Why You Need an Experienced Memphis DUI Defense Attorney
The stakes in a DUI case are simply too high to handle alone or with a public defender who is juggling hundreds of other cases. You need a Memphis criminal defense attorney who knows the Shelby County court system inside and out — the judges in General Sessions and Criminal Court, the assistant district attorneys in the DA's office, and the specific procedures and tendencies of each courtroom.
At Wells & Associates, attorney Murray B. Wells has defended hundreds of DUI cases throughout Memphis and Shelby County. We know how to analyze breathalyzer calibration records, challenge improper police procedures, negotiate with prosecutors, and take cases to trial when the state won't offer a fair deal. Our Downtown Memphis office at 81 Monroe Ave, Suite 200, is open and available around the clock — because DUI arrests don't happen during business hours.