How Often Does a DUI Case Get Dismissed?

Yes, a DUI case can get dismissed, but how often does a DUI case get dismissed? The odds depend on the specifics of your arrest, the evidence against you, and how well your defense attorney challenges that evidence. (Source: national dismissal rate for DUI cases)

Table of Contents

• Can a DUI Case Get Dismissed?
• Why DUI Case Dismissal Rates Vary by Jurisdiction
• Common Reasons DUI Cases Get Dismissed
  • Problems with the Traffic Stop or Probable Cause
  • Errors in Field Sobriety Testing
  • Breathalyzer and Blood Test Reliability Issues
  • Evidence Suppression and Constitutional Violations
• When a DUI Gets Dismissed Before Trial
• DUI Case Dismissal Timeline and Procedural Deadlines
• DUI Charge Dropped vs. Dismissed: What's the Difference?
• Factors That Affect Your Dismissal Chances
• What Happens After a DUI Dismissal
• Frequently Asked Questions

Last Updated: October 18, 2026

Can a DUI Case Get Dismissed?

The Law Offices of Robert E. Ray has spent decades defending DUI clients in Weld County and Northern Colorado. Dismissal versus conviction often comes down to whether the prosecution's case has legal or procedural weaknesses that can be exposed.

A DUI dismissal typically happens when the defense identifies a flaw in the stop, the tests, or evidence handling. These flaws don't have to prove you weren't impaired, they just have to show the government violated your constitutional rights or failed to follow procedure.

Why DUI Case Dismissal Rates Vary by Jurisdiction

There's no single national dismissal rate for DUI cases. Dismissal percentages vary dramatically from county to county, state to state, and even judge to judge.

Why? Because dismissal depends on several jurisdiction-specific factors:

• Local court practices: Some judges are stricter about enforcing constitutional protections during traffic stops. Others give police broader discretion. Some courts routinely grant motions to suppress evidence. Others rarely do.
• Prosecutor discretion: Different district attorneys' offices have different policies. Some aggressively pursue borderline cases. Others screen out weak cases before they reach trial.
• State law differences: DUI laws vary by state. Some states have stricter requirements for administering field sobriety tests. Others have different standards for what counts as probable cause.
• Police training and standards: In jurisdictions where police receive rigorous DUI training, stops and tests tend to be more defensible. In areas with less training, procedural errors are more common.

When asking how often does a DUI case get dismissed, statistics like "10 to 30 percent of DUI cases get dismissed" are usually drawn from a specific jurisdiction over a specific time period.

The best way to understand your own dismissal chances is to have a criminal defense attorney review the specific facts of your arrest.

Common Reasons DUI Cases Get Dismissed

Most DUI dismissals happen because of one of these categories of problems: issues with the traffic stop itself, flaws in field sobriety testing, problems with breath or blood testing, or violations of your constitutional rights.

Problems with the Traffic Stop or Probable Cause

A police officer can't pull you over just because they feel like it. The officer needs reasonable suspicion of a traffic violation or criminal activity. If the stop was illegal, everything that followed, field sobriety tests, breath test, your statements, can be suppressed.

Common stop problems include:

• No valid reason for the stop: The officer saw nothing wrong with your driving but stopped you anyway. Or the reason they cite doesn't match what happened (they claim you crossed the center line, but dash cam footage shows you didn't).
• Pretextual stops: The officer stops you for a minor traffic violation but really wants to investigate DUI. This is technically legal, but if the stop reason is fabricated or exaggerated, it becomes illegal.
• Racial profiling or discriminatory enforcement: If you can show the officer stopped you based on race or ethnicity rather than legitimate suspicion, the stop is unconstitutional.
• Vague or minor violations: Some jurisdictions have ruled that certain minor violations (like a broken taillight) don't give enough reason for a stop that turns into a DUI investigation.

When a stop is ruled illegal, the judge suppresses all evidence obtained after it, field sobriety tests, breath test results, and your statements. Without that evidence, the case often falls apart.

Errors in Field Sobriety Testing

Field sobriety tests (the walk-and-turn, one-leg stand, and horizontal gaze nystagmus tests) are subjective. They depend on the officer's observation and interpretation, which creates room for error and defense challenges.

Common testing errors include:

• Improper administration: The officer didn't follow the standardized procedure. Maybe they didn't demonstrate the test correctly, didn't give clear instructions, or didn't score it accurately.
• Environmental factors: The test was conducted on uneven ground, in poor lighting, or in heavy traffic. These conditions affect balance and performance.
• Medical conditions: You have a legitimate balance disorder, inner ear problem, or injury that affects performance on these tests. The officer didn't ask about these conditions.
• Divided attention: The officer was conducting the test while also operating a flashlight, writing notes, or managing traffic. This affects their ability to observe your performance accurately.
• Lack of training: Some officers haven't received proper certification in administering these tests. Their testimony about what they observed becomes less credible.

Field sobriety tests are not chemical tests or objective measurements. A skilled defense attorney can challenge the officer's interpretation and the test's validity.

Breathalyzer and Blood Test Reliability Issues

Chemical tests (breath and blood) seem more objective than field sobriety tests, but they have significant reliability issues, among the most common reasons DUI cases get dismissed.

Breathalyzer problems include:

• Improper calibration: The machine wasn't calibrated properly before or after your test. Without proper calibration records, the test results are unreliable.
• Operator error: The officer administering the test wasn't properly trained. They didn't follow the required waiting period before the test, didn't observe you for 15 minutes beforehand, or didn't conduct the test correctly.
• Rising blood alcohol defense: Your blood alcohol level was rising at the time of the test. You may have been below the legal limit while driving but above it when tested.
• Mouth alcohol or medical conditions: You had mouth alcohol from mouthwash, burped, or have a medical condition like acid reflux that affects the reading.

Blood test problems include:

• Chain of custody issues: The blood sample wasn't properly stored, labeled, or tracked. There's no way to verify it was your sample or that it wasn't contaminated.
• Testing procedure violations: The blood wasn't drawn by a qualified phlebotomist, or the draw site wasn't properly sterilized.
• Lab errors: The lab that tested your blood made mistakes in analysis or record-keeping.
• Fermentation: The blood sample fermented after collection, producing alcohol that wasn't in your system at the time of driving.

When a chemical test is unreliable, a judge may suppress it or let the jury hear about the reliability problems. Either way, the prosecution's strongest evidence becomes questionable.

Evidence Suppression and Constitutional Violations

Beyond stop and test problems, DUI cases get dismissed when the government violates your constitutional rights, the Fourth Amendment's protection against unreasonable searches and seizures, the Fifth Amendment's protection against self-incrimination, and the Sixth Amendment right to counsel.

Common constitutional violations include:

• Illegal search or seizure: The officer searched your vehicle or person without your consent and without a warrant.
• Statements without Miranda warnings: You made incriminating statements after being arrested without being read your Miranda rights.
• Denial of counsel: You asked for an attorney and the officer continued questioning you anyway.
• Violation of discovery rules: The prosecution didn't turn over evidence to your attorney that could help your defense.

When a constitutional violation occurs, the remedy is often suppression of the evidence obtained through it. Without that evidence, the prosecution's case weakens or collapses.

When a DUI Gets Dismissed Before Trial

Many DUI cases get dismissed before trial through pretrial motions, usually a motion to suppress evidence. Your attorney files the motion, the judge holds a hearing, and if the judge agrees evidence was obtained illegally, it gets suppressed.

If enough evidence is suppressed, the prosecution may lack admissible evidence to proceed, and the prosecutor often dismisses rather than go to trial with a weak case.

Other reasons for pretrial dismissal include:

• Prosecutorial discretion: The prosecutor reviews the case and decides it's too weak to pursue.
• Violation of speedy trial rights: The case has been pending too long without trial, and the judge dismisses it to protect your constitutional right to a speedy trial.
• Insufficient evidence: At a preliminary hearing, the judge finds the prosecution hasn't presented enough evidence to establish probable cause. The case is dismissed.
• Witness unavailability: A key witness (usually the officer who made the arrest) becomes unavailable, and the prosecution can't proceed without that testimony.

Pretrial dismissal is often the best outcome: your case ends without a trial, a conviction, or the stress and expense of court.

DUI Case Dismissal Timeline and Procedural Deadlines

The timeline from arrest to dismissal varies. Understanding the key deadlines helps you know what to expect.

Initial appearance: Within 24 to 72 hours of arrest, you appear before a judge.

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Preliminary hearing: Within 10 to 14 days, the prosecution must show probable cause that you committed the crime.

Arraignment: You enter a plea (guilty, not guilty, or no contest). If you plead not guilty, the case moves forward.

Pretrial motions: Your attorney files motions to suppress evidence, challenge the stop, or address other legal issues.

Trial: If the case isn't dismissed or resolved, it goes to trial.

DUI Charge Dropped vs. Dismissed: What's the Difference?

People often use "dropped" and "dismissed" interchangeably, but they mean different things.

A charge is dropped when the prosecution decides not to pursue the case. The prosecutor files a motion to dismiss or simply doesn't proceed.

A case is dismissed when a judge orders it dismissed.

The practical outcome is similar: your case ends and you're not convicted. But the reason matters.

For your record, both outcomes are good. If charges are dropped or dismissed, you may be able to have the arrest record sealed or expunged, depending on your jurisdiction.

Factors That Affect Your Dismissal Chances

Your actual chances of getting your case dismissed depend on specific factors about your arrest and your jurisdiction.

The strength of the evidence against you is the starting point.

The legality of the stop matters enormously.

The quality of the officer's report and training affects credibility.

The jurisdiction and the judge matter. Some judges are stricter about enforcing constitutional protections. Some jurisdictions have higher dismissal rates than others.

Your attorney's skill in identifying weaknesses and challenging evidence makes a real difference.

Whether you have a criminal history can affect how a prosecutor treats your case.

What Happens After a DUI Dismissal

If your DUI case is dismissed, the criminal charges against you are gone. But dismissal doesn't automatically erase the arrest from your record.

Your arrest record still exists. The arrest happened. The record is public.

Professional licenses and certifications may not be affected. If you worried a DUI arrest might affect a professional license, a dismissal removes that concern.

Your driving record is clear. A dismissed DUI doesn't result in a DUI conviction on your driving record.

The key takeaway: a dismissal is a real win. The case ends without a conviction, and you can move forward without a DUI on your record.

If you're facing a DUI charge in Greeley or Weld County, the outcome depends on the specific facts of your case and how aggressively your defense is pursued.