The Complete DUI Defense Guide — Every Stage, Every Defense, Every Question

You got pulled over. The blue lights hit your mirror and your stomach dropped. Now you're reading this at 2 AM trying to figure out what happens next and whether you're completely screwed.

You're not. But you might be if your attorney treats your case like every other DUI that comes through their door.

This is the guide your DUI attorney should have given you the day you hired them. Every stage of a DUI case, every defense that actually works, every question you should be asking, and every deadline that can make or break your outcome. All of it, in one place, in plain English.

Bookmark this page. You're going to need it.

How to Use This Guide

Your DUI case is going to unfold in stages. Most defendants experience those stages in a fog of panic, Googling one thing at a time, never seeing the full picture. That's by design. The less you understand, the easier you are to process through the system.

This guide follows your case chronologically — from the moment of arrest through final resolution. At each stage, we'll cover what's happening, what defenses apply, what your attorney should be doing, and what questions you should be asking.

We've also linked to our in-depth posts on specific topics throughout. Think of this as the map, and those posts as the detailed terrain guides.

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Stage 1: The DUI Arrest — Night Zero

Everything that matters starts here. The traffic stop, the field sobriety tests, the breathalyzer or blood draw, the arrest itself. Every piece of evidence the prosecution will use against you was gathered in the span of about 60 minutes. And the officers who gathered it made decisions — and mistakes — that your entire defense may hinge on.

What Happens During a DUI Stop

The officer pulls you over. They approach the window. They're looking for three things: the smell of alcohol, slurred speech, and bloodshot eyes. Within about 30 seconds, they've already decided whether they're investigating a DUI. Everything after that is building their case.

They'll ask if you've been drinking. They'll ask where you're coming from. They'll ask you to step out of the vehicle.

What you should know: Everything you say and do from this point is being recorded — dashcam, bodycam, or both. That footage is evidence. And it cuts both ways. If you were steady on your feet, polite, and coherent, the footage may contradict the officer's report that you were "visibly impaired." If you were a mess, the footage confirms it.

The Traffic Stop Must Be Legal

Here's the first thing most defendants don't know: the officer needed a reason to pull you over. Not a hunch. Not a feeling. Reasonable suspicion based on specific, articulable facts.

Valid reasons include traffic violations (speeding, running a red light, failure to signal), equipment violations (broken taillight, expired tags), and driving behavior consistent with impairment (weaving across lane markings, extreme speed variation).

But officers push the boundaries constantly. "Weaving within your lane" is not the same as crossing lane markings, and courts are split on whether it constitutes reasonable suspicion. "Driving slowly" — going 5 under the speed limit — is legal and almost never sufficient. Anonymous tips without corroboration are constitutionally thin.

If the traffic stop itself was illegal, everything that followed — the field sobriety tests, the breathalyzer, the arrest — is fruit of the poisonous tree. It all gets suppressed. Game over for the prosecution.

Your attorney's job: Review the dashcam footage and the officer's stated reason for the stop. Compare what the officer wrote in the report to what the video actually shows. If there's a gap, that's a suppression motion.

For a deep dive on every defense angle, read our complete breakdown: Can Your DUI Be Dismissed? The Defenses Your Attorney Should Be Exploring.

Field Sobriety Tests: The 77% Problem

After pulling you over, the officer will likely ask you to perform Standardized Field Sobriety Tests (SFSTs). There are exactly three tests validated by NHTSA — the National Highway Traffic Safety Administration:

1. Horizontal Gaze Nystagmus (HGN) — the officer moves a stimulus (pen, finger) in front of your eyes and watches for involuntary jerking
2. Walk-and-Turn — nine heel-to-toe steps, turn, nine steps back
3. One-Leg Stand — stand on one foot for 30 seconds while counting

Anything else — touching your nose, reciting the alphabet backward, counting backward from 100 — is not standardized, not validated, and carries zero scientific weight. If the officer used non-standardized tests, that's already a problem.

Here's the part the prosecution never mentions: NHTSA's own research says these tests are wrong 18% of the time even when administered perfectly. The one-leg stand alone is wrong more than a third of the time. Those numbers assume perfect conditions — flat, dry, level surface, proper lighting, correct instructions, accurate timing.

Your test was administered on the shoulder of a highway at midnight with flashing lights behind you and cars blowing past at 60 mph. Perfect conditions? Not a chance.

Officers deviate from NHTSA protocols constantly. They rush the HGN test (each pass should take approximately 2 seconds — many officers complete the entire test in under a minute). They administer walk-and-turn on gravel or sloped pavement. They forget to ask about medical conditions that affect balance. They don't time the one-leg stand. They skip the instruction demonstration.

Every deviation from the NHTSA standard is a crack in the prosecution's case. Enough cracks, and the whole thing crumbles.

We wrote an entire post breaking down every NHTSA standard and every way officers violate them: NHTSA Field Sobriety Test Standards: What Officers Get Wrong.

The Breathalyzer: A Machine, Not a Verdict

You blew a number. Maybe .08. Maybe .12. Maybe .18. That number feels like a conviction. It's not.

A breathalyzer is a machine. It needs regular calibration to stay accurate. It needs a certified operator. It needs a proper 15-20 minute observation period before the test. It has an inherent margin of error of plus or minus .005 to .02 BAC.

If you blew .08 or .09, that margin of error alone could put you under the legal limit. And that's assuming everything else was done correctly.

The calibration records for the specific device used in your test exist. They're obtainable through discovery. If the machine was overdue for calibration, if the operator's certification had lapsed, if the observation period was cut short — the BAC result is challengeable.

Breathalyzers also don't measure blood alcohol directly. They measure breath alcohol and multiply by a standard ratio (2100:1) to estimate blood alcohol. But that ratio varies between individuals — from 1100:1 to 3500:1 depending on body temperature, breathing patterns, and other biological factors. Some people will consistently test higher on a breathalyzer than their actual blood alcohol level.

Barry Scheck, co-founder of the Innocence Project, built his career on one principle: never trust the conclusion — audit the process that produced it. That principle applies directly to breathalyzers. The BAC number is the conclusion. The calibration records, operator certification, and observation period documentation are the process.

We have a full post covering every breathalyzer challenge point and exactly what records your attorney should be requesting: Breathalyzer Calibration: The Evidence Your Attorney Should Be Pulling.

Blood Tests: Different Machine, Different Problems

If your BAC was measured via blood draw instead of a breathalyzer, different challenges apply — but challenges absolutely exist.

Chain of custody. Your blood sample traveled from the officer's needle to a vial to a transport container to a lab to an analyst. Every handoff is documented (or supposed to be). A break in the chain — a missing signature, an unaccounted-for time gap, improper storage temperature — calls the result into question.

Fermentation. Improperly stored blood samples can ferment, producing alcohol that wasn't there when the blood was drawn. If the sample sat in a warm patrol car trunk or a storage room without proper temperature control, fermentation is a real possibility.

Contamination. Was the draw site swabbed with a non-alcohol antiseptic? Using an alcohol swab before drawing blood for a BAC test contaminates the sample. It happens more than you'd think.

Rising blood alcohol. Alcohol takes 30-90 minutes to fully absorb. If you had your last drink shortly before driving, your BAC while driving may have been below .08 — and only rose above .08 by the time the blood was drawn 45 minutes later at the station. This is a legitimate defense called the "rising blood alcohol defense," and it requires expert testimony but is powerful when the timeline supports it.

Timing. How long between the traffic stop and the blood draw? The longer the gap, the less the test result reflects your BAC while you were actually driving.

After the Arrest: The First 48 Hours

You're released — probably on your own recognizance for a first offense. You go home. You feel terrible. You can't sleep. You start Googling.

What to do immediately:

• Write everything down. Everything you remember about the stop, what the officer said, what tests were administered, the conditions, the timing. Memory fades fast. Get it on paper now.
• Preserve evidence. GPS data, timestamps, text messages showing when you left, credit card receipts from the bar. Anything that establishes a timeline.
• Say nothing on social media. Nothing. Not even vague posts about "going through a tough time." Prosecutors check social media.
• Don't talk about the case with anyone except your attorney. Friends, family, coworkers — none of them have attorney-client privilege.

For the full reality of what the first days, weeks, and months look like, read: What to Expect After a DUI Arrest: A Timeline From Someone Who's Been There.

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Stage 2: The DMV Hearing — The Deadline Nobody Mentions

Here's something your DUI attorney might not tell you until it's too late: you have approximately 10 days after arrest to request a DMV administrative hearing, or your license gets suspended automatically.

This is not part of your criminal case. It's a completely separate proceeding run by the DMV with its own rules, its own timeline, and its own consequences. Your criminal attorney is focused on court dates and plea negotiations. Meanwhile your driving privileges are on a countdown clock.

Why the DMV Hearing Matters More Than You Think

Most attorneys treat it as a formality. File the request to preserve the license, show up, lose, move on. That's the lazy playbook.

Lawrence Taylor, the attorney who wrote Drunk Driving Defense — the textbook that other DUI lawyers study from — calls the DMV hearing "the most overlooked weapon in DUI defense." Here's why:

At the DMV hearing, the arresting officer has to testify under oath. Your attorney gets to cross-examine them. The testimony is recorded. Everything the officer says is locked in.

If they testify one way at the DMV hearing and differently at the criminal trial months later, that inconsistency becomes powerful impeachment material. If they can't remember details at the DMV hearing, that memory gap is documented.

The DMV hearing is a free preview of the prosecution's case. The state shows their cards while the defense doesn't have to show anything.

The Deadline Is Not Flexible

• California: 10 days to request a DMV hearing. Miss it: automatic 4-month suspension (first offense) or 1-year (refusal).
• Florida: 10 days to request a formal review hearing. Miss it: automatic 6-month suspension (first offense) or 12-month (refusal).
• Texas: 15 days to request an ALR hearing. Miss it: automatic 90-day suspension (fail) or 180-day (refusal).

No extensions. No "I didn't know" exceptions. No second chances.

Questions to ask your attorney this week:

1. Has the DMV hearing been requested?
2. Are you planning to attend and cross-examine the officer?
3. What's your strategy for the hearing?
4. Will you get the transcript?

For the full breakdown of why the DMV hearing is a strategic weapon and how your attorney should be using it, read: The 10-Day DMV Deadline Your Attorney Might Not Mention.

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Stage 3: Arraignment — Your First Court Date

Your arraignment is the formal beginning of the criminal case. The charges are read, you enter a plea, bail is discussed, and the next court date is set. The whole thing takes about 5 minutes once your name is called.

What Happens

You show up. You wait (possibly for hours — courts process many cases per session). Your name is called. The judge reads the charges. Your attorney enters a plea on your behalf.

You will almost certainly plead not guilty. This is standard procedure, not a moral statement. Pleading not guilty preserves your rights, gives your attorney time to review the evidence, and keeps every option open. Never plead guilty at arraignment — not without your attorney's thorough analysis of the evidence, which hasn't happened yet at this stage.

The judge sets bail conditions (if you're not already out) and schedules the next court date.

What Your Attorney Should Tell You After Arraignment

Within days of the arraignment, you should know:

1. When discovery will arrive
2. What the preliminary defense strategy looks like
3. Whether there are any immediate deadlines (like the DMV hearing — if it hasn't been filed yet, it may already be too late)
4. When you'll hear from them next
5. Whether there's anything you should be doing (character letters, treatment programs, employment documentation)

If your attorney walks out of arraignment and you don't hear from them for three weeks, that's a problem. Set communication expectations now.

For a full walkthrough of arraignment, read: What Happens at Your Arraignment.

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Stage 4: Discovery — The Evidence Arrives

Discovery is the prosecution's obligation to share the evidence against you with the defense. In a DUI case, this typically includes:

• The police report — the officer's narrative of the stop, the observations, the arrest
• Dashcam and bodycam footage — often the most important evidence in the entire case
• Breathalyzer or blood test results — with (hopefully) calibration records and chain of custody documentation
• Field sobriety test documentation — how the tests were conducted and scored
• Dispatch records — what called the officer's attention to you in the first place
• Officer training and certification records — SFST certification, breathalyzer operator certification
• 911 calls or anonymous tips — if the stop was based on a report from a third party

What Your Attorney Should Be Doing With Discovery

This is where the real defense work happens. Your attorney should be systematically reviewing every piece of evidence for weaknesses, inconsistencies, and constitutional violations.

Compare the report to the footage. Officers write their reports after the arrest, sometimes hours later. The report says "subject was visibly impaired and unsteady on his feet." Does the dashcam show the same thing? Or does it show someone who walked a straight line from the car to the shoulder? These contradictions are gold.

Audit the breathalyzer process. Request calibration records for the specific device by serial number. Check operator certification. Verify the observation period was actually observed. Calculate whether the margin of error affects the result.

Review FST administration frame by frame. If bodycam footage captured the field sobriety tests, compare the officer's test administration against NHTSA protocols. Were the instructions complete? Was the surface level and dry? Was the HGN test conducted at the proper speed? Was the one-leg stand actually timed?

Check the traffic stop justification. What articulable facts did the officer cite for the stop? Does the dashcam support them? If the stated reason was "weaving," does the footage actually show weaving — or does it show a car driving normally within its lane?

For a detailed guide on understanding what's in your discovery packet and what to look for, read: How to Read Your Discovery.

Five Questions to Ask Your Attorney About Discovery

These are the questions that separate defendants who get processed from defendants who get defended:

1. Have you received and reviewed the complete discovery packet?
2. Have you watched the dashcam and bodycam footage — all of it?
3. Have you requested the breathalyzer calibration records and operator certification?
4. Have you compared the police report to the video footage for inconsistencies?
5. Have you identified any suppression issues?

If the answer to any of those is no, and you're past the 30-day mark, ask why. For more questions you should be asking at every stage, read: 5 Questions Your DUI Attorney Doesn't Want You to Ask.

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Stage 5: Motions — Where Cases Are Won or Lost

Motions are formal legal requests to the court. In DUI cases, the right motions can gut the prosecution's case before it ever reaches a jury. The wrong motion strategy — or no motion strategy at all — means your attorney is negotiating from a position of weakness.

Motions That Matter in DUI Defense

Motion to Suppress (Illegal Traffic Stop). If the officer lacked reasonable suspicion to stop you, everything that followed — the FSTs, the BAC test, the arrest — gets thrown out. This is the nuclear option, and it wins more DUI cases than most people realize.

Motion to Suppress (Illegal Arrest). Even if the stop was legal, the officer needed probable cause to arrest you. If the FSTs were improperly administered or the only evidence of impairment was the odor of alcohol, probable cause may not hold up.

Motion to Exclude BAC Results. Breathalyzer calibration issues, operator certification lapses, observation period violations, blood test chain of custody breaks — any of these can be grounds to exclude the BAC number from evidence. Without the number, the prosecution has to prove impairment through officer testimony alone.

Motion to Exclude Field Sobriety Test Results. If the tests were administered contrary to NHTSA standards — wrong surface, incorrect instructions, rushed timing, no medical history inquiry — the results are not "standardized" tests. They're just an officer's opinion.

Motion to Dismiss. If the prosecution's case has fundamental defects — insufficient evidence, constitutional violations that can't be cured, speedy trial violations — the case can be dismissed outright.

Motion in Limine. Prevents prejudicial or irrelevant evidence from reaching the jury. For example, preventing the prosecution from referencing a prior arrest that didn't result in a conviction.

What If Your Attorney Hasn't Filed Any Motions?

If you're two months into your case, discovery has been received, and your attorney hasn't filed or discussed any motions, ask this question: "What motions are you planning to file, and when?"

If the answer is "we'll see what the offer is" — that's not a motion strategy. That's waiting for the prosecution to tell your attorney what your case is worth. Read more about this: What Motions Should Your Attorney Be Filing?.

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Stage 6: Plea Negotiations vs. Trial Preparation

At some point, the prosecution will offer a plea deal. This is the fork in the road where most DUI cases get resolved — and where most defendants make a decision with incomplete information.

Before You Consider Any Plea Deal

Your attorney should have completed the following before you evaluate any plea offer:

1. Reviewed all dashcam and bodycam footage
2. Analyzed the traffic stop legality
3. Audited the breathalyzer calibration records and operator certification
4. Evaluated FST administration against NHTSA standards
5. Reviewed blood test chain of custody (if applicable)
6. Identified and filed any viable suppression motions
7. Assessed the strength of the prosecution's case honestly

If those steps haven't been completed, your attorney is negotiating blind. And a blind negotiation always favors the prosecution.

Understanding the Plea Options

DUI plea negotiations can result in several different outcomes:

• Plead to the original DUI charge — full consequences including criminal record, license suspension, fines, DUI school, increased insurance
• Reduced to "wet reckless" — reckless driving involving alcohol. Lower fines, shorter probation, still counts as a prior DUI in many states
• Reduced to reckless driving — no DUI on your record. Significantly better for employment, insurance, and future legal exposure
• Deferred prosecution / diversion — complete a program and the charges are dropped. Not available everywhere, and usually only for first offenses
• Dismissal — charges dropped entirely, usually after successful suppression motions

The Questions Before You Sign

Before accepting any plea deal, you should know:

1. Exactly what you're pleading to — the specific charge, not a summary
2. Every consequence — jail time, probation, fines, license suspension, ignition interlock, DUI school, insurance impact, employment impact, immigration consequences, ability to expunge later
3. What happens if you reject the deal — can your attorney articulate the trial strategy and realistic odds?
4. Whether suppression motions have been explored — if not, why are you negotiating before knowing whether key evidence can be excluded?

For a deeper exploration of the plea decision, read: Should You Take the Plea Deal?.

If You Go to Trial

DUI trials are relatively short — often 1-3 days. The prosecution presents the officer's testimony, the BAC evidence, and any other evidence of impairment. The defense challenges the stop, the tests, the procedures, and the reliability of the evidence.

Jury selection matters enormously in DUI cases. People have strong opinions about drunk driving. Your attorney should be looking for jurors who understand that "charged" doesn't mean "guilty" and who can evaluate technical evidence critically.

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The 7 Common DUI Defenses — Summary Table

Here's a quick-reference table of the most common DUI defenses, what they challenge, and what makes them viable in your case.

| # | Defense | What It Challenges | Success Indicators | |---|---------|-------------------|-------------------| | 1 | Illegal Traffic Stop | Reasonable suspicion for the stop itself | Dashcam contradicts officer's stated reason; stop based on "weaving within lane," anonymous tip, or pretextual equipment violation | | 2 | Improper Field Sobriety Tests | NHTSA protocol compliance | Tests on uneven/sloped surface; rushed HGN; no medical history inquiry; non-standardized tests used; bodycam shows deviations | | 3 | Breathalyzer Calibration Failure | Reliability of BAC result | Device overdue for calibration; failed calibrations in history; expired reference solution; operator certification lapsed | | 4 | Observation Period Violation | Pre-test protocol compliance | Officer was not continuously observing for 15-20 minutes; bodycam shows officer distracted during observation period | | 5 | Blood Test Chain of Custody | Integrity of blood sample | Missing signatures on custody forms; improper storage temperature; alcohol swab used at draw site; time gaps in documentation | | 6 | Rising Blood Alcohol | BAC at time of driving vs. time of testing | Short time between last drink and driving; long delay between stop and test; BAC near the legal limit | | 7 | No Probable Cause for Arrest | Legal basis for the arrest itself | Only evidence of impairment was odor of alcohol; FST results don't support impairment; driver was coherent and cooperative on video |

Key insight: These defenses aren't mutually exclusive. A strong DUI defense often stacks multiple challenges. The traffic stop was questionable AND the FSTs were improperly administered AND the breathalyzer was overdue for calibration. Each crack weakens the prosecution's case. Enough cracks, and it collapses.

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Stage 7: Resolution — How DUI Cases End

Most first-offense DUI cases resolve within 3-6 months. Contested cases with active motion practice and trial preparation can take 6-12 months or longer.

Typical First-Offense Outcomes

Best realistic outcomes (no accident, no injury, no prior record):

• Charges reduced to reckless driving (no DUI on record)
• Deferred prosecution / diversion program (charges dropped after program completion)
• DUI conviction with minimal probation, no jail time
• Dismissal after successful suppression motion

What to expect regardless of outcome:

• Probation (typically 6-12 months for a first offense)
• DUI school or alcohol education program
• Fines and court costs ($500-$2,000+)
• Possible license restriction or ignition interlock device
• Increased insurance premiums for 3-5 years
• Total real cost: $10,000-$25,000 over several years

The Things Nobody Tells You

It feels worse than it is. A first-offense DUI, while serious, is rarely the life-ending disaster you're imagining at 3 AM. Most people get through it. Many get reduced charges. Almost none go to prison for a first offense with no accident.

Your attorney's engagement matters more than their promises. The attorney who says "I'll fight to get this dismissed" but never reviews the dashcam footage is worse than the attorney who says "this will be tough, but here's our plan" and actually executes it.

The DMV hearing is often harder than the criminal case. States can suspend your license administratively, separate from the criminal case. Many defendants lose their license because their attorney missed the deadline or didn't prepare.

You'll get through this. It doesn't feel like it right now. But you will.

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The DUI Defense Timeline — At a Glance

Here's your case timeline with the critical actions at each stage:

Day 1 (Arrest)

• Write down everything you remember
• Preserve all evidence (GPS, texts, receipts)
• Say nothing on social media
• Call a DUI attorney

Days 1-10 (DMV Deadline)

• Request DMV administrative hearing — this is the most time-sensitive item in your entire case
• Hire a DUI attorney if you haven't already

Week 2-4 (Attorney Hired)

• Attorney reviews police report and initial documents
• Attorney requests discovery from prosecution
• Ask the 5 questions your attorney doesn't want you to ask

Month 1-2 (Discovery Phase)

• Discovery arrives — police reports, footage, BAC records, FST documentation
• Attorney reviews dashcam footage, compares to police report
• Attorney requests breathalyzer calibration records
• Attorney evaluates FST administration against NHTSA standards
• DMV hearing occurs (if requested) — officer testimony locked in

Month 2-4 (Arraignment and Motions)

• Arraignment — plead not guilty
• Attorney files suppression motions based on discovery review
• Court rules on motions — this often determines the case trajectory

Month 3-6 (Plea Negotiations or Trial Prep)

• Prosecution makes plea offer
• Attorney evaluates offer against realistic trial assessment
• Decision point: accept plea, counter-offer, or prepare for trial

Month 4-12 (Resolution)

• Case resolves through plea agreement, trial, or dismissal
• Post-conviction obligations begin (probation, DUI school, etc.)

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Holding Your Attorney Accountable

Here's the uncomfortable truth: not every DUI attorney does the work. Some collect the retainer, file the appearance, show up to court, and negotiate whatever plea the prosecutor offers without ever challenging the evidence.

That's not defense. That's processing.

A DUI attorney who's earning their fee should be doing all of the following:

• Reviewing every second of dashcam and bodycam footage
• Requesting and analyzing breathalyzer calibration records
• Evaluating field sobriety test administration against NHTSA standards
• Checking officer certification and training records
• Investigating the legal basis for the traffic stop
• Filing suppression motions where warranted
• Preparing for trial even if a plea deal is likely
• Communicating with you regularly about the case status and strategy

If your attorney isn't doing these things, it's not because they can't. It's because nobody is holding them accountable. You are paying for a defense. Make sure you're getting one.

For more on this topic, read: Is Your Attorney Actually Working Your Case?.

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What We Do

We don't replace your attorney. We make sure they earn what you're paying them.

We review your DUI case — the traffic stop, the field sobriety tests, the BAC evidence, the officer's report, the discovery — and we tell you exactly what questions to ask, what motions should be filed, and what defenses your attorney should be exploring.

We give you the information. You bring the questions. Your attorney does the work.

That's how accountability works.

Ready to know what your attorney should be doing?

• Get your DUI Case Decoder report — we analyze your case documents and give you a detailed breakdown of every defense angle, every question to ask, and every motion that should be on the table.
• Take our free case score assessment — answer a few questions about your case and get an instant evaluation of your defense posture.

Your case. Your money. Your freedom. Know what you're paying for.

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This is legal information, not legal advice. We are not attorneys and do not provide legal representation. DUI laws, defenses, and procedures vary significantly by state — always consult with a licensed DUI attorney in your jurisdiction.