EVAN CHRISTOPHER VARGAS, ESQ.
Senior Partner – Liberty Criminal Defense & DUI Lawyers
21+ Years Experience | Licensed Since 2004 | Bilingual English / Español
Corona: (909) 773-2356 Irvine: (949) 804-3487
Free Consultation
Arrested for driving under the influence of drugs in Riverside, San Bernardino, or Orange County? Attorney Evan Christopher Vargas has defended drug DUI cases across Southern California since 2004. Don’t face a DUID charge alone.
A drug DUI in California, formally known as a DUID (Driving Under the Influence of Drugs), is charged under California Vehicle Code § 23152(f). The statute makes it unlawful for any person who is under the influence of any drug to drive a vehicle.
Unlike alcohol DUI, which carries a legal per se limit of 0.08% blood alcohol concentration (BAC), there is no numerical threshold for drug DUI. The prosecution must prove that the drug impaired your ability to drive as a reasonably cautious, sober person would. This impairment-based standard makes these cases highly fact-specific and, in many situations, defensible.
California Vehicle Code § 23152(f): “It is unlawful for a person who is under the influence of any drug to drive a vehicle.” The keyword is “under the influence,” meaning the drug must have impaired your driving ability to an appreciable degree. |
Because there is no roadside breathalyzer for drugs, law enforcement uses a multi-step investigation process:
Each of these steps involves subjective judgment and technical processes that an experienced DUID defense attorney can scrutinize, challenge, and potentially dismantle.
The penalties for a drug DUI conviction in California mirror those for alcohol DUI and escalate significantly with each subsequent offense. Understanding these consequences is critical to appreciating why skilled legal representation matters.
1st Offense Misdemeanor | |
Jail | Up to 6 months |
Fines & Fees | $1,500–$2,000+ |
License Suspension | 6 months (DMV) |
DUI School | 3–9 months |
Probation | 3–5 years |
IID | Possible |
2nd Offense Misdemeanor | |
Jail | 96 hrs – 1 year |
Fines & Fees | $1,800–$2,800+ |
License Suspension | 2 years |
DUI School | 18–30 months |
Probation | 3–5 years |
IID | Required |
3rd Offense Felony Risk | |
Jail/Prison | 120 days – 1 yr+ |
Fines & Fees | $2,500–$3,000+ |
License Revocation | 3 years |
DUI School | 30 months |
Probation | 5 years |
IID | Required |
Every case is different. An experienced DUID attorney can often negotiate for reduced charges, dismissal of counts, or alternative sentencing that minimizes these life-altering penalties.
While the charges carry similar penalties, drug DUI cases are fundamentally different from alcohol DUI cases in ways that directly affect how they are prosecuted and defended.
Factor | Drug DUI (DUID) – VC § 23152(f) | Alcohol DUI – VC § 23152(a/b) |
Per Se Limit? | No — impairment-based only | Yes — 0.08% BAC |
Primary Test | Blood draw & DRE evaluation | Breathalyzer or blood test |
Measurable Standard | Subjective – officer & expert opinion | Objective – numeric BAC |
Residual Detectability | THC detectable days after impairment | Alcohol clears within hours |
Prescription Defense | Possible mitigating factor | N/A |
DRE Required | Often — adds 12-step evaluation | Rarely |
Defense Complexity | Higher — more challenging evidence | Moderate |
The lack of a per se legal limit for drug DUI is a double-edged sword. While it means you can be charged even for tiny amounts of a substance in your blood, it also means the prosecution must prove impairment, which is a far more subjective standard that a skilled attorney can challenge aggressively.
A drug DUI charge is not a conviction. The evidence used in DUID cases is often less reliable than many people assume. Attorney Evan Vargas examines every element of the prosecution’s case and pursues every available defense strategy.
1 | Illegal Traffic Stop If the officer lacked reasonable suspicion or probable cause to stop your vehicle, all evidence gathered after that stop may be suppressed under the Fourth Amendment. This can result in full dismissal. |
2 | Challenging the DRE Evaluation The Drug Recognition Expert protocol has 12 steps. Any deviation, improper training, or failure to follow procedure undermines the opinion. Courts have recognized DRE evidence as fallible. |
3 | Blood Test Inaccuracy Blood samples can be contaminated, improperly stored, or mishandled in the lab. Chain of custody errors, fermentation artifacts, or lab protocol violations can make test results unreliable. |
4 | No Actual Impairment The presence of a drug in your blood does not equal impairment. THC, for example, can be detected for days after its effects have completely worn off. We challenge the connection between the substance and any actual driving impairment. |
5 | Lawfully Prescribed Medication If you were taking medication as prescribed by a physician and were not impaired, this is a powerful defense. We document your prescription history, dosage, and tolerance to counter impairment claims. |
6 | Field Sobriety Test Errors FSTs are notoriously inaccurate for drug cases and are affected by nervousness, fatigue, physical conditions, and the environment. We examine administration, officer training, and conditions at the time of testing. |
7 | Rising Drug Level Defense Similar to the rising BAC defense in alcohol cases, it may be possible to show that your drug level was lower while driving than when the blood was drawn later — challenging the impairment timeline. |
8 | Unlawful Blood Draw A blood draw must comply with legal requirements, which means proper consent, medical personnel, or a valid warrant. If the draw was unlawful, the blood evidence may be suppressed entirely. |
What you do in the hours and days after a DUID arrest can profoundly affect the outcome of your case. Follow these steps to protect your rights and give your defense attorney the best possible foundation.
⚠️ The 10-Day DMV Rule: This deadline is non-negotiable. Missing it means automatic license suspension, which is separate from and in addition to any criminal court penalties. Call (909) 773-2356 right now if you’ve been arrested. |
A Southern California native, Attorney Evan Christopher Vargas earned his J.D. from the University of West Los Angeles School of Law in 2003 and was admitted to the California State Bar in 2004. For more than 20 years, he has dedicated his practice to aggressive criminal defense across Southern California, with a particular focus on DUI and drug DUI (DUID) cases.
Evan understands that a drug DUI arrest is one of the most frightening experiences a person can face. He combines tenacious courtroom advocacy with genuine empathy, guiding every client through the legal process step by step and making sure you understand every option available to you.
Liberty Criminal Defense & DUI Lawyers serves clients throughout Riverside County (Riverside, Corona, Murrieta, Temecula, Hemet, Palm Springs), San Bernardino County (Ontario, Rancho Cucamonga, Fontana, Victorville, San Bernardino), Orange County (Irvine, Anaheim, Santa Ana, Costa Mesa, Newport Beach, Fullerton, Garden Grove), and greater Los Angeles County.
These are the most frequently asked questions about drug DUI charges in California.
A drug DUI, or DUID (Driving Under the Influence of Drugs), is charged under California Vehicle Code § 23152(f). Unlike alcohol DUI, there is no legal per se limit; a driver is guilty only if drugs impaired their ability to drive safely, regardless of the amount detected. This standard applies to marijuana, prescription medications, over-the-counter drugs, and illegal narcotics.
A first-offense DUID in California is typically a misdemeanor carrying up to 6 months in county jail (often avoided with probation), fines and assessments totaling $1,500–$2,000 or more, a 6-month DMV license suspension, 3–9 months of DUI school, and 3–5 years of informal probation. An ignition interlock device may also be required.
Yes. California law does not exempt legally prescribed medications. If a prescription drug impairs your ability to drive safely, you can be charged with DUID under VC § 23152(f). However, an experienced attorney can challenge the impairment evidence and raise a valid prescription as part of the defense.
Alcohol DUI has a per se legal limit of 0.08% BAC. Drug DUI has no such limit; it is purely impairment-based. Drug DUIs require a Drug Recognition Expert (DRE) evaluation, blood or urine toxicology testing, and field sobriety tests. This makes the evidence more subjective and often easier to challenge.
Yes. The DMV will automatically suspend your license following a drug DUI arrest. You have only 10 days from the date of arrest to request a DMV Administrative Per Se (APS) hearing to contest the suspension. A criminal conviction carries an additional court-ordered suspension.
Possibly. A DUID conviction can have serious immigration consequences for non-citizens, including green card holders and visa holders. It may be classified as a crime of moral turpitude or an aggravated felony depending on the circumstances.
A DUI conviction in California stays on your DMV driving record for 10 years. It may remain on your criminal record indefinitely unless expunged. Under PC § 1203.4, you may be eligible for expungement after completing probation.
Yes, in many cases. An experienced DUID defense attorney can challenge the legality of the traffic stop, the DRE evaluation, blood/urine test results, and chain of custody. Charges can sometimes be reduced to a wet reckless or dry reckless, or dismissed entirely, where the evidence is insufficient.
Yes. Even though recreational marijuana is legal in California, driving under its influence is illegal. There is no legal THC limit for driving; impairment is assessed by officers and DREs through field sobriety tests and blood testing. THC can remain detectable in blood for hours or days after impairment has ended, which makes these cases highly defensible.
Act quickly: (1) Exercise your right to remain silent. (2) Within 10 days of arrest, request a DMV APS hearing to fight your license suspension. (3) Do not discuss the case with anyone except your attorney. (4) Contact an experienced California DUID defense lawyer as soon as possible. Early intervention is critical!
— Get Help Now —
Facing a drug DUI offense in California is serious. The sooner you have experienced legal representation, the better your chances of a favorable outcome. Contact us 24/7! All consultations are free and confidential.
Corona / Inland Empire 4160 Temescal Canyon Rd, Suite 401 Corona, CA 92883 | Irvine / Orange County 300 Spectrum Center Drive, Suite 400 Irvine, CA 92618 |
