September 8, 2025 By Paul Wallin

Things To Know When Facing A DUI Trial: DUI Drug Offenses | California VC 23152

Driving under the influence isn’t limited to alcohol consumption. California Vehicle Code Section 23152 encompasses drug-related DUI offenses that can result in serious criminal charges and life-altering consequences. If you’re facing DUI drug charges, understanding the legal landscape is important for protecting your rights and building an effective defense strategy.

Our experienced criminal defense attorneys at Wallin & Klarich can guide you through the legal process. Call Wallin & Klarich today toll-free at (877) 466-5245 for your free consultation with one of our appeals attorneys near you.

Understanding California’s DUI Drug Laws

California Vehicle Code Section 23152 addresses drug-related driving offenses. The law defines a “drug” broadly as any substance or combination of substances, other than alcohol, that could affect the nervous system, brain, or muscles of a person to such a degree that it impairs their ability to drive safely.

The key distinction from alcohol-related DUI charges is that there’s no specific blood concentration threshold that automatically establishes guilt. Instead, the prosecution must prove actual impairment of driving ability.

The Critical Requirement: Actual Impairment

Unlike alcohol DUI cases where a blood alcohol concentration of 0.08% or higher creates a legal presumption of impairment, drug DUI cases require proof of actual impairment. This requirement creates both challenges and opportunities in defending drug DUI cases. The prosecution cannot simply point to the presence of drugs in your system; they must prove that those substances actually impaired your driving ability at the time of operation.

This standard requires the prosecution to present evidence beyond mere detection of substances. They must show concrete signs of impairment, which may include:

  • Erratic driving patterns or traffic violations
  • Field sobriety test results
  • Physical symptoms observed by the arresting officer
  • Performance on coordination tests
  • Statements made by the defendant

California’s Testing Procedures

When arrested for suspected drug DUI, California law provides specific protocols for chemical testing:

Blood Testing: The amount of THC present in a blood sample may be probative regarding whether the driver was under the influence. However, this evidence alone is typically insufficient for conviction without additional signs of impairment.

Choice of Tests: A person arrested for driving under the influence of drugs has the choice of a blood or breath test under Vehicle Code Section 23612(a)(2)(B). However, if an officer has reasonable cause to believe an additional test will reveal evidence of drug influence, they may require both tests.

Urine Testing: If a person is incapable of completing a blood test, they must submit to and complete a urine test under Vehicle Code Section 23612(a)(2)(C).

The Importance of Expert Testimony

Drug DUI cases often require expert testimony to explain complex concepts to judges and juries. Experts may testify about:

  • How specific drugs affect the human body
  • The relationship between blood concentration and impairment
  • Individual factors that affect drug metabolism
  • Limitations of testing procedures
  • Alternative explanations for observed symptoms

Contact Wallin & Klarich Today  

If you are facing DUI charges, you need to contact an aggressive defense attorney to fight for your freedom. With 40+ years of experience, our attorneys at Wallin & Klarich have helped many clients ensure they receive a fair trial in their criminal defense cases. We know the most effective strategies to argue on your behalf, and we will do everything in our power to help you achieve the best possible result in your case.

At Wallin & Klarich, we have offices all over Southern California: Irvine, Pasadena, Riverside, San Bernardino, San Diego, Torrance, Victorville, and Anaheim. Additionally, our law firm can handle many types of cases statewide.

Discover how our team can assist you. Contact us today, toll-free at (877) 466-5245 for a free consultation with a skilled defense attorney near you.

Paul Wallin

AUTHOR: Paul Wallin

Paul Wallin is one of the most highly respected attorneys in Southern California. His vast experience, zealous advocacy for his clients and extensive knowledge of many areas of the law make Mr. Wallin a premiere Southern California attorney. Mr. Wallin founded Wallin & Klarich in 1981. As the senior partner of Wallin & Klarich, Mr. Wallin has been successfully representing clients for more than 30 years. Clients come to him for help in matters involving assault and battery, drug crimes, juvenile crimes, theft, manslaughter, sex offenses, murder, violent crimes, misdemeanors and felonies. Mr. Wallin also helps clients with family law matters such as divorce and child custody.

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