Can You Be Charged With a DUI Without Evidence? click for a free consultation

Posted on March 6, 2026 in DUI Charges

The short answer to the question of whether you can be charged for DUI in Arizona without evidence is no.

Evidence is the cornerstone of any criminal prosecution in Arizona, including a charge of driving under the influence of alcohol or drugs (DUI). If the prosecution does not have enough evidence to prove beyond a reasonable doubt that you are guilty of the crime you have been charged with, then you cannot be convicted of that crime.

For the remainder of this blog post, we will consider the kinds of evidence that police officers and prosecuting attorneys will look for to justify pulling you over for suspected DUI, and what kinds of evidence they will look for as grounds for probable cause to arrest you for DUI.

If you are facing a DUI charge in Arizona, call Rosenstein Law Group at (480) 248-7666 or reach out to us online.

What is Evidence to Support Reasonable Suspicion of DUI?

Charging you with DUI in Arizona is based on two levels of evidence. The first is evidence to support a police officer’s reasonable suspicion that a crime has been committed or is being committed. 

A law enforcement officer cannot pull you over based on a guess, or a hunch, or other irrelevant considerations like your race, gender, or the make or model of your car, or the time of day or night, or whether the officer saw you driving away from a bar or restaurant that serves alcohol. Courts see these kinds of grounds as arbitrary or capricious.

Any attempt to charge you with DUI based on this kind of non-evidence will make it possible that the court would grant a motion to dismiss the charge.

Here are some examples of observed impairment evidence that can support reasonable suspicion to pull you over for suspected DUI:

• Weaving within your lane or between lanes
• Speed not reasonable or prudent, which includes driving below the speed limit
• Making wide turns
• Erratic driving, such as nearly striking objects or other vehicles
• Erratic braking or acceleration
• Failing to obey traffic signals or signs

Reasonable suspicion based on driving behavior that suggests signs of impairment or other circumstantial evidence is not sufficient grounds to arrest you for DUI. It is only justification to support further investigation in determining if probable cause exists to arrest you for DUI.

What is Evidence to Support Probable Cause for a DUI Charge?

Police officers are trained to be careful observers of a driver’s behaviors. As soon as you begin to interact with a police officer who has pulled you over based on reasonable suspicion of DUI, that officer will begin evaluating and establishing whether probable cause exists to arrest you for DUI based on alcohol and/or drug impairment.

Probable cause means that a reasonable person would conclude, based on the evidence, that a crime has been committed.

This decision will depend in part on additional observational factors, including:

• The police officer’s observations of your physical appearance and demeanor, like bloodshot eyes or slurred speech
• Your answers to the officer’s questions
• Your driving behavior
• Whether the officer smells alcohol on your breath
• Whether the officer sees any physical evidence, like an open alcohol container in the car
• Whether any witness testimony or video evidence exists to support a conclusion that you were impaired
• Your performance on Standardized Field Sobriety Test(s)

If the officer’s observations indicate that you may have been drinking and driving, then the officer will likely seek to establish whether more evidence exists to support a probable cause determination that you were impaired while driving. Two common ways to gather this evidence are having you provide a breath, blood, or urine sample to measure your blood alcohol concentration (BAC), and to ask you to perform field sobriety tests.

• For example, if your BAC sample shows a level of any alcohol, this is statutory evidence under Arizona law to support a DUI charge.
• Or, if the officer believes that your performance during standardized field sobriety tests supports a conclusion that you are impaired, this can be direct evidence to support a probable cause arrest.

Under Arizona’s admin per se/implied consent law, all drivers in Arizona must verbally consent to a blood alcohol test, or tests. If you refuse to provide a breath sample into the Intoxilyzer 9000 breath testing machine back at the station or DUI processing van (I.e., NOT the Portable Breath Testing device, a.k.a., “PBT”, the small handheld device often administered while still on the side of the road), and/or refuse to consent to a blood draw then your Arizona driving privileges will automatically be suspended for not less than 12 months. You can refuse to participate in field sobriety tests, and refusing such a test will not have any implications on your Arizona driving privileges. To sum it up: only refusing to consent to a blood draw and/or breath sample into the Intoxilyzer 9000 machine can result in a 12-month suspension of your Arizona driving privileges.

The prosecutor needs enough compelling evidence to prove the elements of a DUI crime beyond a reasonable doubt. Even though this is the highest burden of proof in the criminal justice system, it can be accomplished if sufficient cumulative evidence exists. This means that you could conceivably be convicted of DUI even without using BAC test results as evidence, as long as the other evidence against you is strong enough. 

Challenging Evidence in an Arizona DUI Prosecution

If the officer concludes that the available evidence supports a probable cause conclusion to arrest you for suspected DUI, then the prosecuting attorney will review this evidence to decide whether to charge you with the offense.

If the prosecuting attorney concludes that the evidence against you will hold up in court, chances are you will be formally charged with DUI. At this point, your DUI defense attorney will need to examine the evidence the police have gathered to see if any possibility exists to have the evidence thrown out.

This evidentiary review by your attorney will look for weaknesses like:

• Whether the police followed proper procedures in gathering the evidence against you (illegal search or seizure in violation of your Constitutional rights)
• Whether the police followed proper procedures in informing you of your Constitutional rights and observing those rights while you were in police custody (Miranda rights violations, such as failing to inform you of your right to remain silent, your right to counsel during custodial questioning, or coercing a confession from you)
• Whether the police and the prosecution committed any errors while the evidence against you was in their possession (chain of custody violations)
• Whether any equipment used to gather your BAC test sample that showed you were over the legal limit was improperly calibrated or maintained, or the person who collected the sample made any errors in doing so
• Whether the person who tested your sample made any errors in the testing procedures
• Whether the officer who administered any field sobriety tests to you administered them properly
• Whether the officer’s report of the arrest contains any errors, or if the arresting officer’s memory of the facts and circumstances leading to your arrest is inconsistent
• Whether an officer’s conclusion that you were in actual physical control of a motor vehicle can be challenged
• Whether any witness statements against you can be challenged based on inconsistencies or other grounds that can cast reasonable doubt on the accuracy or veracity of the witness’s observations

It is important to remember that you are innocent unless and until the prosecution can prove that you are guilty of DUI, beyond a reasonable doubt.

In the legal process of a criminal charge, you do not have to “prove your innocence.” It is the prosecution’s responsibility to prove you were impaired while in actual physical control of a motor vehicle. Improperly collected and/or maintained evidence may be excluded from being used against you in court and/or may cast enough reasonable doubt in the minds of a jury.

An experienced DUI attorney, like one you will have if you choose the Rosenstein Law Group to represent you, will know what to look for when examining the evidence the police have gathered against you. If any weaknesses that exist in the prosecution’s evidence, or you can point to other possible causes of apparent impairment like a medical condition and/or ailments, then your criminal defense attorney may be able to negotiate with the prosecution for a reduced charge or even seek to have the prosecution’s case dismissed (if the evidentiary flaws are serious enough).

Have You Been Charged With DUI in Arizona?

While you cannot be subject to a DUI conviction in Arizona without evidence, it may surprise you what can serve as sufficient evidence against you if you are subject to a DUI arrest. Do not underestimate the prosecution’s case: if you receive a DUI conviction, you will face mandatory jail time, substantial financial penalties, license suspension, an ignition interlock device requirement, have points added to your license, and more.

Protect yourself and improve your chances of a favorable outcome by hiring a DUI defense lawyer from Rosenstein Law Group as soon as possible—even before criminal charges are entered against you. 

In your legal defense, one of our experienced Arizona DUI attorneys can thoroughly scrutinize every possible source of DUI evidence against you and prepare the strongest available legal representation. 

Speak to a DUI defense lawyer today at our law office by calling (480) 248-7666, or use our online contact form for more information or to schedule a free consultation with us.