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Home » Blog » Top 10 DUI Defenses and DUI Mistakes in Los Angeles, California 

Top 10 DUI Defenses and DUI Mistakes in Los Angeles, California 

Feb 25, 2025

Douglas Parker

Facing a DUI charge in Los Angeles can be daunting, but it’s important to remember that an arrest does not automatically mean conviction. The burden rests on the prosecution to prove guilt beyond a reasonable doubt. With skilled legal representation, numerous strategies exist to challenge the validity and admissibility of DUI evidence.

At Manshoory Law Group, our experienced criminal defense attorneys meticulously examine every aspect of your case—from the initial traffic stop to chemical test results—identifying weaknesses in the prosecution’s claims and ensuring your rights are protected. This guide outlines several effective DUI defense strategies that can be pivotal in safeguarding your freedom and future.

Top DUI Mistakes Los Angeles Drivers Make!

  • Not Having a Designated Driver

Before going out for drinks, designate a driver to get you home safely. If you can’t assign a designated driver, request a Lyft or Uber or find the number to a local cab company. If you are unable to do so, bars and restaurants can always find a cab for you.

Being proactive will always save you money, and it can also keep you from losing your license, paying fines, obtaining points on your driving record, and even going to jail.

  • Failure to Obtain a Copy of the Police Report or Witness Information

Not requesting a copy of a police report or other sources of evidence could be detrimental to your case. Police reports[1] can often be the basis of a strong DUI defense strategy.

A witness can offer crucial information that may alter or change the facts of the case. Failure to collect any evidence that can be used in your favor could weaken your case.

DUI Mistakes

  • Failure to Learn Your Miranda Rights

Miranda rights[2] protect your constitutional right to remain silent after an arrest, to have an attorney represent you, and to avoid self-incrimination. To exercise your Miranda rights, it is wise to vocalize your desire to remain silent. If you exercise your right by acknowledging the Miranda warning, you could strengthen your DUI defense.

  • Driving After a License Suspension

If you are caught driving with a suspended license after a DUI suspension, you will face additional consequences and penalties. In addition to a longer license suspension period, you may be sentenced to up to 60 days in jail. Penalties for driving with a suspended license will be added to any previous penalties.

  • Failure to Appear at Your Court Date 

Failure to appear or forgetting your court date could result in a bench warrant for your arrest. The courts will revoke any bail or bonds that you may have posted. It is one of the most harmful mistakes in a DUI case.

A delay in your case may result in the Court denying your attorney additional time once the case is before the Court, solely because of the delay caused by your original absence.

  • Speaking About Your Case to Someone Other Than Your Lawyer

Talking to anyone other than your attorney, such as family, friends, or co-workers, even statements made to your insurance adjuster after a DUI, could be harmful to your case. Even if you think an officer is on your side, do not say anything.

They are not your friends. It is the job of a prosecutor and law enforcement officers to obtain any evidence against you, and anything you say can become incriminating and used against you.

  • Not Hiring the Right Los Angeles DUI Defense Lawyer

Many people try to do the right thing by hiring a Los Angeles DUI attorney after a DUI arrest. Their first mistake is trusting their legal matters to a less experienced lawyer and may base their selection of an attorney solely on cost.

You should be able to trust that your lawyer can be depended on to investigate your case, exhaust all avenues of DUI defense, hire experts, and bring your matter to trial if necessary.

An experienced DUI lawyer can represent your best interests in court. If you refused to take a breath test, didn’t exercise your Miranda rights, or failed to appear in court, a lawyer has the skills and knowledge to fight the allegations made against you with a strong legal DUI defense. Your lawyer can ensure that the prosecution plays by the rules and does not take advantage of you in court.

DUI Defenses

Top 10 DUI Defenses in Los Angeles, California

  1. Blood Alcohol Content (BAC) at the Time of Driving, or “Retrograde Extrapolation”The CDLE requires that officers must follow strict procedures[3] before and after administering any chemical test. Failure to adhere to standards could result in a motion to suppress evidence based on non-compliance with regulations.
  2. Non-Compliance with the California Department of Law Enforcement (CDLE) Standards
    This DUI defense forces the prosecution to try to prove your BAC[4] at the time that you were driving. Your breath or blood test result reading an hour or two later may not be what establishes a DUI conviction. Because BAC can be influenced by food, water, body metabolism, or how much you drank, the state may have a very difficult time trying to prove that your BAC was an illegal amount.
  3. The Confusion Doctrine
    If an officer mixes up the order in which the Miranda rights and implied consent[5] warnings are read to an arrestee, you may win a motion to suppress the evidence of a chemical test or any refusal to submit to the chemical test.
  4. Miranda Rights
    Officers must read Miranda warnings, or your constitutional rights to remain silent and not self-incriminate, in every DUI arrest. If an officer fails to honor your right to silence, you could have grounds to challenge your statements’ admissibility. However, this warning is only required once under arrest, pre-arrest questions do not require the Miranda warning.
  5. Implied Consent Warnings
    As a California driver, you are bound by implied consent laws to submit to a chemical test when asked to do so by an officer. In cases in which an officer does not have probable cause to ask for a chemical test, the evidence gathered against you can be inadmissible in court.
  6. Violation of the 15-Minute Observation Period
    CDLE standards require an officer to observe you for 20 minutes prior to administering a breath test and be reasonably certain that you didn’t regurgitate. If an officer fails to honor this period, test evidence may be suppressed in court.
  7. Actual Physical Control
    Many times, the prosecution and key witnesses cannot even prove that you were in control of a vehicle during a DUI accident.
  8. Motion to Suppress Blood Test Results
    California law prohibits officers from taking blood unless there has been a serious injury, death, or probable cause to believe you were operating a vehicle under the influence. If the reasonable cause cannot be proven, the evidence against you can be suppressed in court.
  9. Illegal Stop
    Officers must have reasonable suspicion to stop your vehicle[5]. Failure to show reasonable cause could result in any evidence gathered from an unlawful stop being dismissed.
  10. Satisfactory FSTs
    Many of us are unfamiliar with the FSTs that are offered to us roadside by an officer. Most of the time, these FSTs are conducted late at night, in the cold, in an unfamiliar spot, and with the idea that if we “fail” we will be arrested. Doing well on these tests, meaning not providing the necessary “clues” an officer is looking for, may assist your DUI defense that you were not impaired or above the legal limit.

dui defense

DUI Evidence Can Be Challenged

Los Angeles DUI cases are among the toughest areas of law because they require knowledge of science and law and demand an understanding of how the two areas affect one another. Just because a breath test determined that your BAC was above the legal limit does not mean that you will be convicted of a DUI offense.

It is the job of the prosecutor to prove your guilt beyond a reasonable doubt, but with the help of an experienced DUI defense attorney, your legal representative can effectively challenge the validity and admissibility of any evidence brought against you.

As a Los Angeles Criminal Defense lawyer, Manshoory Law Group can take a creative approach to help you achieve the best possible resolution after a DUI arrest. If you are ready to fight your DUI allegations, do not hesitate a moment longer. Contact us today for your free consultation at (877) 977-7750.

References

  1. Ms, S. J. (2023, December 1). How to Obtain a Police Report: 11 Steps (with Pictures) – wikiHow. wikiHow. https://www.wikihow.com/Obtain-a-Police-Report

  2. Manshoory, S. (2024, June 29). What are your Miranda rights? Manshoory Law Group, APC. https://manshoorylaw.com/blog/what-are-miranda-rights/

  3. Implementation Guidelines for Alcohol and Drug Regulations – Chapter 7. (n.d.). FMCSA. https://www.fmcsa.dot.gov/regulations/drug-alcohol-testing/implementation-guidelines-alcohol-and-drug-regulations-chapter-7

  4. Manshoory Law Group, APC. (2022, March 9). Legal Alcohol Limit | What are the BAC Levels in California | Manshoory Law. https://manshoorylaw.com/am-i-over-the-drinking-limit/

  5. Parker, D. (2024, April 18). Implied Consent Law in California DUI cases. Manshoory Law Group, APC. https://manshoorylaw.com/blog/implied-consent/