If you were arrested for DUI in Southern California, you’re probably dealing with stress, uncertainty, and a thousand questions all at once: Will I lose my license? Will I go to jail? What happens next? Can I beat this? The good news is that many DUI cases are defendable—especially when the stop was questionable, testing was flawed, procedures weren’t followed, or the evidence doesn’t actually prove impairment beyond a reasonable doubt.
This page focuses on the most common DUI charges in California—Vehicle Code 23152(a) and 23152(b)—often called a “standard” alcohol DUI. If your case involves drugs, injury, refusal, under-21 issues, or other enhancements, those deserve their own strategy and analysis. (We link to those pages throughout so you can go deeper.)
What Is a “Standard” DUI in California?
A “standard” DUI usually means an alcohol-based DUI that’s charged under:
- Vehicle Code 23152(a) (impairment-based DUI), and/or
- Vehicle Code 23152(b) (BAC-based DUI)
These are the charges most people think of after a DUI stop: an officer claims you were impaired, you did field sobriety tests, and you took (or were asked to take) a breath or blood test.
California law generally makes it illegal to drive while under the influence, and also illegal to drive with a BAC of 0.08% or higher.
This page and website provide general information in plain English, not legal advice. Laws and local court/DMV practices vary and can change, so don’t rely on this content for your case—talk to a qualified attorney promptly to review your specific facts, especially if you face charges, a DMV action, or a deadline. In many cases, you’re fighting two battles at once: the DMV process and the criminal court case.
VC 23152(a) vs. VC 23152(b): What’s the Difference?
Impairment DUI: VC 23152(a)
23152(a) is about impairment. The prosecutor’s theory is that alcohol affected your ability to drive like a cautious, sober person.
Key point: You can be charged under 23152(a) even if your BAC is under 0.08, if the state claims you were impaired. Conversely, someone can appear “fine” and still be charged if the officer’s report claims impairment.
“Per Se” BAC DUI: VC 23152(b)
23152(b) is the “per se” DUI. It focuses on your BAC number.
Key point: the state generally tries to prove you were 0.08% or higher at the time of driving. That can raise important timing questions—especially if there was a delay between driving and testing.
Both charges are commonly filed together, and your defense strategy often attacks both: whether the officer had a valid basis to claim impairment and whether the chemical test evidence is reliable and proves BAC at the time of driving.
What the Prosecutor Must Prove
Every DUI case is ultimately about proof. The state must prove the legal elements beyond a reasonable doubt.
For VC 23152(a), prosecutors typically try to prove:
- You drove a vehicle, and
- At the time of driving, you were under the influence of alcohol (impaired)
For VC 23152(b), prosecutors typically try to prove:
- You drove a vehicle, and
- At the time of driving, your BAC was 0.08% or higher
That “time of driving” issue is where many defenses live—because breath/blood tests are often taken after the driving, and the body processes alcohol over time.
Two Cases at Once: DMV vs. Criminal Court
Most people assume the DUI is “one case.” In reality, you may be dealing with:
- The DMV side (Administrative Per Se / license action)
If the DMV takes action against your license, you may have the right to request a hearing. The DMV states that hearings must be requested within 10 days of receiving notice (or 14 days from the date of the notice if it was mailed).
This is why DUI defense is time-sensitive. If you miss that window, you can lose the chance to challenge the suspension through a hearing.
- The criminal court case
This is where you fight the criminal charges and potential conviction. A strong defense can mean reduced charges, improved terms, or—when appropriate—dismissal or a not-guilty outcome.
Common Evidence in DUI Cases
DUI cases are built on a combination of officer observations and testing evidence. The most common pieces of evidence include:
- Reason for the stop (weaving, speeding, equipment violation, checkpoint, etc.)
- Officer observations (odor, red eyes, speech, balance)
- Field sobriety tests (FSTs) (walk-and-turn, one-leg stand, HGN)
- Preliminary alcohol screening (PAS) breath test (roadside breath test)
- Evidentiary breath test (station breath device)
- Blood test results (labs, chain-of-custody documentation)
- Bodycam/dashcam video
- Time stamps (driving time, stop time, arrest time, test time)
A DUI defense attorney’s job is to analyze each piece of evidence and ask: Is it reliable? Is it legally admissible? Does it actually prove the elements beyond a reasonable doubt?
DUI Defense Strategies That Can Make a Real Difference
There is no “one-size-fits-all” DUI defense. A real defense strategy comes from the facts. But here are the most common areas where DUI cases break down.
Traffic stop defenses
Police must have a lawful reason to stop you. Your lawyer may examine:
- whether the officer’s stated reason matches the video
- whether the stop was based on an assumption rather than facts
- whether the officer actually observed a Vehicle Code violation (or just claimed one)
If the stop was unlawful, your attorney may challenge the evidence that flowed from it.
Field sobriety test challenges
Field sobriety tests are not perfect, and they are influenced by:
- anxiety, fatigue, or stress
- injuries, balance issues, age
- uneven surfaces, poor lighting, footwear
- unclear instructions or rushed administration
If the officer’s interpretation is biased or the conditions were poor, the FST “clues” can be misleading.
Breath test defenses
Breath tests can be challenged due to:
- calibration and maintenance issues
- operator procedure errors
- mouth alcohol (burping, regurgitation, dental work, etc.)
- medical conditions like GERD
- timing problems and improper observation periods
Blood test defenses
Blood tests aren’t automatically “stronger.” They can be challenged based on:
- chain of custody issues
- storage and handling problems
- contamination or fermentation
- lab protocols and documentation errors
Rising BAC defense
BAC changes over time. If testing happened long after driving, a key question becomes: What was your BAC at the time of driving? Depending on the timeline, “rising BAC” may create reasonable doubt for a 23152(b) charge.
Checkpoints and enforcement operations
If your arrest started at a checkpoint, the defense may focus on whether the checkpoint was conducted lawfully and consistently.
Potential Penalties for a First-Time DUI (Overview)
Penalties vary based on facts, county practices, and your record. But for a first DUI, California’s sentencing statute includes ranges that can involve jail time and fines. For example, VC 23536 includes a fine range of $390 to $1,000 (before penalty assessments) and jail exposure that can range up to six months, depending on circumstances.
Important: the goal of a DUI defense lawyer is not just to “hope for the best.” It’s to attack the case where it’s weak, and fight for:
- reduced charges (when appropriate)
- minimized penalties
- alternatives where available
- protection of your license
- the best possible long-term outcome for your record and future
What to Do After a DUI Arrest
If your DUI is recent, here are steps that protect you:
1. Speak with a DUI lawyer immediately
The early timeline matters—especially for DMV action and evidence preservation.
2. Save every document you received
DMV paperwork, citations, release papers, towing info—bring it to your consult.
3.Write down your timeline
Where you were, what you ate/drank, when you drove, when you were stopped, what tests happened, what the officer said.
4. Don’t discuss the case with anyone but your attorney
Statements can be used against you.
5. Follow your attorney’s plan for DMV and court
If a DMV hearing request is needed, do it immediately (or have your lawyer do it). DMV deadlines can be short.
DUI Defense FAQs
Can I be charged with DUI if I “felt fine”?
Yes. Officers often rely on observations and FSTs, even when the driver feels okay. The defense then becomes about whether those observations are reliable and whether the evidence proves impairment.
Can I be charged with DUI if my BAC is under 0.08?
You can still face a 23152(a) allegation (impairment-based) even under 0.08, depending on what the state claims.
What if the breath or blood test is wrong?
Testing problems happen. Your lawyer can challenge procedure, maintenance, chain of custody, and timing—depending on the test type.
Will I automatically lose my license?
Not always, but DMV action can move quickly. If you received notice/order of a suspension, deadlines to request a hearing can be very short.