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The Difference Between 23152(a) and 23152(b)
Effective DUI Defense for Your Legal Protection
DUI Charges in California
If you are asking, “What Is the Difference Between 23152a and 23152 b?”, the answer is straightforward: 23152(a) targets impairment, while 23152(b) targets your blood alcohol concentration (BAC). You can be charged with one or both. Prosecutors often file them together to create two paths to conviction, one based on how you were driving and behaving, and the other based on a test result of 0.08% BAC or higher. The penalties are serious and can include fines, license suspension, DUI school, and even jail time. Understanding these differences is the first step in protecting your rights.
At Geller Law, PC, we guide you through this process with clear answers, a decisive strategy, and relentless advocacy. We know how to challenge DUI evidence, push back on weak prosecutions, and build the strongest possible defense for your case. While no outcome can be guaranteed, we work to tip the scales of justice in your favor.
Overview of 23152(a) and 23152(b) DUI Charges
Both charges arise under California Vehicle Code § 23152, but they target different conduct and rely on different evidence.
- 23152(a) is the impairment-based law: It prohibits driving “under the influence” of alcohol or drugs, meaning your ability to drive safely was impaired, even if your BAC was below 0.08%.
- 23152(b) is the per se BAC law: It prohibits driving with a BAC of 0.08% or higher, regardless of whether you appeared impaired.
What 23152(a) Targets: Impairment
Under 23152(a), prosecutors aim to prove that alcohol, drugs, or a combination impaired your ability to drive safely. There is no required BAC threshold. The case often relies on:
PRACTICE AREAS
- Driving pattern evidence (swerving, speeding, drifting, or unsafe turns)
- Physical signs (odor of alcohol, bloodshot eyes, slurred speech, unsteady balance)
- Field sobriety test performance
- Officer observations, body-cam or dash-cam footage, and witness accounts
Even if a chemical test later reports a BAC under 0.08%, the prosecution can still pursue a conviction under 23152(a) based on impairment.
What 23152(b) Targets: BAC of 0.08% or Higher
Under 23152(b), the state only needs to prove that your BAC was 0.08% or higher when you were driving. This is a “per se” standard: the test result itself is the core evidence. Your driving may have looked fine, and you may have shown few signs of impairment, yet you can still be convicted based on the number alone.
Prosecutors typically rely on breath or blood test results and supporting documentation such as:
- Machine calibration and maintenance records
- Operator certification
- Sample collection and chain-of-custody records
- Lab protocols and compliance
Because 23152(b) is test-driven, a strong defense often focuses on attacking the reliability of those results. We look closely at timing, procedure, and equipment, details that can make or break a case.
Why Both 23152(a) and 23152(B) Charges Are Often Filed Together
Many clients are surprised to learn they have been charged with both statutes. The reason is strategic. California law allows prosecutors to file multiple offenses arising from one incident when they involve related conduct. Penal Code § 954 explicitly authorizes this approach.
Here’s what this means for you:
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If the state struggles to prove visible impairment under 23152(a), it may still push for a conviction under 23152(b) based on BAC alone.
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If there are issues with the BAC test, timing, machine calibration, or blood handling, the state may still pursue 23152(a) based on officer observations.
We design your defense to meet this dual threat. Our team addresses both the subjective evidence of impairment and the scientific evidence behind BAC. That two-track strategy is essential in any case where both charges appear.
Penalties and Consequences for 23152(a) and 23152(B) Offenses
Although the legal theories differ, the penalties for 23152(a) and 23152(b) are typically similar for a first offense. Sentences usually merge so that you are not punished twice for a single act, consistent with Penal Code § 654. Still, the consequences can be broad and serious.
Typical First-Offense Exposure
If convicted of a first-time DUI under 23152(a) or 23152(b), you may face:
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Fines of $390 to $1,000, with penalty assessments often pushing the total above $3,000
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A driver’s license suspension (often six months for a first offense)
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Up to six months in county jail
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DUI education (commonly 3–9 months)
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Informal probation, often 3–5 years
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Potential ignition interlock device (IID) requirements
Even a seemingly “routine” DUI can carry significant collateral consequences. You may see higher insurance premiums, professional licensing impacts, and background check issues. That is why a focused defense is critical from day one.
Repeat Offenses and Aggravating Factors
Penalties escalate for repeat offenses and when aggravating facts are present. For example:
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Second offense: Mandatory minimum jail time (commonly at least 96 hours), longer suspension, and extended DUI school
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Third offense: Substantial jail time (often a minimum of 120 days), longer suspension, and possible habitual traffic offender designation
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Fourth offense within 10 years: Potential felony filing with exposure to state prison
Aggravating factors can raise the stakes on any DUI. These include:
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DUI causing injury (charged under Vehicle Code § 23153)
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Minor under 14 in the vehicle
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Excessive speed or reckless driving
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Very high BAC (often 0.15% or higher)
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Chemical test refusal
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Commercial drivers (stricter 0.04% BAC limit)
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Underage drivers (zero-tolerance policies)
We challenge aggravating allegations with the same intensity that we challenge the base charge. The goal: reduce your exposure and protect your record wherever possible.
How a DUI Lawyer Can Protect Your Rights and Freedom
At Geller Law, PC, we move fast, dig deep, and build a defense that targets both the impairment and the BAC evidence. Our team knows the science behind breath and blood testing and the courtroom tactics prosecutors use. We bring that experience to your case from day one.
How We Pressure-Test the State’s Case
We do not take the evidence at face value. We scrutinize every piece the prosecution intends to use:
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Breath and blood testing: We review machine maintenance, operator certification, sample handling, fermentation issues, and rising BAC timing.
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Field sobriety tests: We examine whether they were properly administered and whether medical or environmental conditions skewed results.
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Stop and arrest: We challenge the basis for the stop, the length of detention, and whether your constitutional rights were respected.
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Video and reports: We compare officer narratives to dash-cam or body-cam footage and test the state’s claims against the record.
Our courtroom strategy is direct and decisive. We identify and leverage legal and factual flaws to advocate for charge reductions, dismissals, or favorable terms.
Why Early Intervention Matters
Timing can change outcomes. The sooner we step in, the more we can do to protect you. Early action allows us to:
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Request your DMV hearing before the deadline and fight to preserve driving privileges
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Secure and preserve video, calibration logs, and witness accounts
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Investigate test timing and potential rising BAC scenarios
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Build leverage for negotiations and pretrial motions
Our Commitment to You
We are your dedicated DUI attorneys. At Geller Law, PC, we believe in direct communication, bold strategy, and relentless defense. Sam Geller leads from the front with courtroom experience, cross-examination skill, and a commitment to protecting your freedom. We make sure you understand every step, every option, and every risk—and we stand beside you throughout the process.
Take the Next Step to Defend Your Rights
To recap the core question, what is the difference between 23152a and 23152 b? 23152(a) is about impairment, and 23152(b) is about a BAC of 0.08% or higher. Prosecutors often file both to maximize their chances. The penalties can include fines, license suspension, DUI school, and jail time, as well as DMV consequences that may take effect immediately. You need a team that understands both charges and how to attack them from every angle.
At Geller Law, PC, we act fast, build aggressively, and protect your future. We make sure you understand your rights, your options, and your path forward. If your case is in San Francisco or the surrounding areas, we are ready to step in now.
If you are ready to move forward, contact the Geller Law, PC today so we can start building your defense.
