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)
Last Updated: October 18, 2026
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.
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:
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.
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.
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:
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.
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:
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.
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:
Blood test problems include:
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.
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:
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.
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:
Pretrial dismissal is often the best outcome: your case ends without a trial, a conviction, or the stress and expense of court.
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.
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.
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.
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.
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.
Dismissal rates vary significantly by jurisdiction, ranging from roughly 10% to 30% depending on local court practices, prosecutor discretion, and the strength of evidence. No universal percentage applies across all states or counties. Factors like whether procedural errors occurred, the quality of the stop, and the reliability of chemical tests all influence outcomes. Your specific dismissal chances depend on the details of your case and local court dynamics.
DUI cases commonly get dismissed due to problems with the traffic stop (lack of reasonable suspicion), errors in field sobriety tests, breathalyzer or blood test reliability issues, improper chain of custody, and constitutional violations during arrest or evidence collection. Evidence suppression motions often succeed when police fail to follow proper procedures. An experienced defense attorney can identify procedural defects that prosecutors may have overlooked.
Yes, DUI cases can be dismissed before trial through motions to suppress evidence, prosecutorial discretion, or plea negotiations. Dismissals often occur during pretrial hearings when judges rule that evidence was obtained illegally or that probable cause was insufficient. Some prosecutors may also dismiss weak cases based on evidentiary problems or procedural errors discovered during discovery.
A charge is typically dropped when the prosecutor decides not to pursue it before formal charges are filed, often due to weak evidence or procedural issues. A dismissal occurs after charges have been filed and the case is terminated by the court, usually through a successful motion or prosecutorial decision. Both result in no conviction, but timing and circumstances differ. Understanding this distinction helps you evaluate your case outcome.