A first refusal typically triggers a one-year DMV administrative license suspension (longer with priors), with a right to an administrative hearing if requested within the statutory window. Refusal can enhance the criminal DUI sentence and may support additional jail terms under § 23612. Birchfield permits criminal penalties for breath refusal; blood draws for criminal punishment generally need a warrant. That is what separates California refusing a breathalyzer from a generic national summary. Read Cal. Veh. Code § 23612 before the background sections below. California drivers are deemed to consent to chemical testing of breath or blood when lawfully arrested for DUI under Vehicle Code § 23612. The officer must admonish the driver about the consequences of refusal.
License suspension and administrative hearings
A first refusal typically triggers a one-year DMV administrative license suspension (longer with priors), with a right to an administrative hearing if requested within the statutory window.
The DMV / administrative track often runs separately from the criminal DUI case. Missing the short window to request an administrative hearing can lock in a suspension even if the criminal charge is later reduced or dismissed. Always calendar the administrative deadline the same day as the arrest.
Criminal consequences of refusal
Refusal can enhance the criminal DUI sentence and may support additional jail terms under § 23612. Birchfield permits criminal penalties for breath refusal; blood draws for criminal punishment generally need a warrant.
Under Birchfield v. North Dakota, the Fourth Amendment allows criminal penalties for refusing a warrantless breath test incident to a lawful DUI arrest, but generally requires a warrant (or a recognized exception) before the State may impose criminal penalties for refusing a blood draw. Missouri v. McNeely rejected a per-se exigency based solely on natural dissipation of alcohol in the blood. California statutes and case law implement those federal baselines with local detail.
Can refusal be used as evidence?
Refusal is admissible in the criminal case and may be argued as consciousness of guilt; juries also hear about the chemical-test admonition.
Prosecutors often argue consciousness of guilt; defense counsel emphasize confusion, inadequate advisories, or medical inability to provide a sample. The precise jury instruction language is state-specific — search California opinions for “refusal” and “implied consent.”
A concrete California scenario
Here is one way the California pieces fit together. Change any fact and the statute may point somewhere else.
A driver is arrested for DUI in California and refuses the evidentiary chemical test after the implied-consent advisory.
- Identify the administrative consequence under Cal. Veh. Code § 23612: A first refusal typically triggers a one-year DMV administrative license suspension (longer with priors), with a right to an administrative hearing if requested within the statutory window.
- Separate that track from the criminal case: Refusal can enhance the criminal DUI sentence and may support additional jail terms under § 23612. Birchfield permits criminal penalties for breath refusal; blood draws for criminal punishment generally need a warrant.
- Ask whether the refusal can be argued to the jury: Refusal is admissible in the criminal case and may be argued as consciousness of guilt; juries also hear about the chemical-test admonition.
- If the request is for blood rather than breath, apply the warrant rule: Drivers usually choose breath or blood when both are available; if breath is refused, officers commonly seek a warrant for blood. Forced blood draws without a warrant are limited after Birchfield and Missouri v. McNeely.
In California the refusal question is answered first by Cal. Veh. Code § 23612, then by the administrative deadline and the criminal case.
Breath tests versus blood tests
Drivers usually choose breath or blood when both are available; if breath is refused, officers commonly seek a warrant for blood. Forced blood draws without a warrant are limited after Birchfield and Missouri v. McNeely.
Practical tip: a driver who refuses breath may still face a warrant-backed blood draw. Refusal does not create a permanent shield against chemical evidence; it mainly adds administrative (and sometimes criminal) consequences on top of the underlying DUI case.
Practical tips
- Ask whether the stop and arrest were lawful — implied consent usually requires a lawful DUI arrest first.
- Diary the administrative hearing deadline immediately.
- Do not confuse portable roadside breath screens with the evidentiary breathalyzer at the station; statutes often treat them differently.
- Research California opinions on implied consent, refusal, and license revocation in LawDiver before a contested DMV hearing.
Case law: implied consent and refusal in California
JIM SIKES CAHALL, Plaintiff and Appellant, v. DEPARTMENT OF MOTOR VEHICLES, Defendant and Respondent
…hemical test in compliance with the pro *494 visions of the Implied Consent Law (Veh. Code, § 13353). Appellant then sought mandamus relief in the superior court. The petition was denied and a judgment (order) entered accordingly. This appeal followed. Inasmuch as the appellant stipulated at the time of the administrative hearing that probable cause for arrest existed and that…
On implied consent / breathalyzer refusal, JIM SIKES CAHALL, Plaintiff and Appellant, v. DEPARTMENT OF MOTOR VEHICLES, Defendant and Respondent speaks to the California dispute in this passage: "Implied Consent Law (Veh. Code, § 13353). Appellant then sought mandamus relief in the superior court. The petition was denied and a judgment (order) entered accordingly. This appeal followed." The surrounding opinion shows how the court applied that language to the record.
THE PEOPLE, and v. ANTHONY A. HARRIS, and
THE PEOPLE, and v. ANTHONY A. HARRIS, and, 225 Cal. App. Supp. 4th 1 (2014)
…h Amendment by defendant’s consent pursuant to California’s implied consent law—consent he never purported to withdraw by refusing to comply with the blood draw. In the unpublished portion of this opinion, we find that there was sufficient evidence to establish that the blood draw was performed in a reasonable manner. Accordingly, we affirm the trial court’s denial of defendant…
California opinions such as THE PEOPLE, and v. ANTHONY A. HARRIS, and are cited where implied consent / breathalyzer refusal is disputed. The court stated: "Amendment by defendant’s consent pursuant to California’s implied consent law—consent he never purported to withdraw by refusing to comply with the blood draw." That is the language to brief; the rest of the decision supplies the procedural posture.
The PEOPLE, Plaintiff and Respondent, v. BRIAN KEITH BURY, Defendant and Appellant
…s blood-alcohol level (BAL) after a lawful arrest under the implied consent law. (§23157, subd. (a)(1); 72 Ops.Cal.Atty.Gen. 226, 227, 229 (1989).) We rule the PAS test evidence introduced at appellant’s trial was admissible. *1199 Facts At 1:40 a.m. on February 10, 1994, California Highway Patrol Officer David Hall was on patrol with his partner Officer Pedro Leon on highway 1…
California opinions such as The PEOPLE, Plaintiff and Respondent, v. BRIAN KEITH BURY, Defendant and Appellant are cited where implied consent / breathalyzer refusal is disputed. The court stated: "BAL) after a lawful arrest under the implied consent law. (§23157, subd. (a)(1); 72 Ops.Cal.Atty.Gen. 226, 227, 229 (1989).) We rule the PAS test evidence introduced at appellant’s trial was admissible. *1199 Facts At 1:40 a.m." That is the language to brief; the rest of the decision supplies the procedural posture.
THE PEOPLE, and v. REBECCA MASON, and
THE PEOPLE, and v. REBECCA MASON, and, 8 Cal. App. Supp. 5th 11 (2016)
…r she was “required” to submit to a chemical test under the implied consent law, but without the officer providing the full implied consent admonishment, including any of the consequences of refusal. After a thorough review of the record, which consists of undisputed facts pertaining to the motion, we hold that notwithstanding California’s implied consent law, which we recogniz…
On implied consent / breathalyzer refusal, THE PEOPLE, and v. REBECCA MASON, and speaks to the California dispute in this passage: "r she was “required” to submit to a chemical test under the implied consent law, but without the officer providing the full implied consent admonishment, including any of the consequences of refusal. After a thorough review of the record, which consists of undisputed facts pertai" The surrounding opinion shows how the court applied that language to the record.
The PEOPLE, Plaintiff and Respondent, v. DONALD KEITH WILSON, Defendant and Appellant
…does not satisfy the chemical testing requirement under the implied consent law. [Citation] . . . The express exemption of PAS devices from the implied consent law was necessary to correct the problem “that occurs when a DUI suspect submits to a pre-arrest Aleo-Sensor test but subsequently refuses to submit to a post-arrest blood, breath or urine test as required under section…
California opinions such as The PEOPLE, Plaintiff and Respondent, v. DONALD KEITH WILSON, Defendant and Appellant are cited where implied consent / breathalyzer refusal is disputed. The court stated: "does not satisfy the chemical testing requirement under the implied consent law. [Citation] . . . The express exemption of PAS devices from the implied consent law was necessary to correct the problem “that occurs when a DUI suspect submits to a pre-arrest Aleo-Sensor test but su" That is the language to brief; the rest of the decision supplies the procedural posture.
THE PEOPLE, and v. STEVEN ALFRED AGNEW, and
THE PEOPLE, and v. STEVEN ALFRED AGNEW, and, 242 Cal. App. Supp. 4th 1 (2015)
…otality of the circumstances in the context of California’s implied consent law. We therefore reverse the granting of the motion to suppress and remand the case. FACTS AND PROCEDURAL BACKGROUND Defendant and respondent Steven Alfred Agnew was charged with driving under the influence of alcohol in violation of both subdivisions (a) and (b) of Vehicle Code section 23152, misdemea…
On implied consent / breathalyzer refusal, THE PEOPLE, and v. STEVEN ALFRED AGNEW, and speaks to the California dispute in this passage: "California’s implied consent law. We therefore reverse the granting of the motion to suppress and remand the case." The surrounding opinion shows how the court applied that language to the record.
LLOYD FRANKLIN BUTLER, Plaintiff and Appellant, v. DEPARTMENT OF MOTOR VEHICLES, Defendant and Respondent
…chemical test for blood-alcohol content under California’s implied consent law (Veh. Code, § 13353). Appellant contends that the arresting officer did not afford him his statutory right to choose among alternative chemical tests. We conclude that the record refutes appellant’s position as a matter of law. Therefore we affirm. The arresting officer (Tonelli) and another officer…
LLOYD FRANKLIN BUTLER, Plaintiff and Appellant, v. DEPARTMENT OF MOTOR VEHICLES, Defendant and Respondent is worth reading on California implied consent / breathalyzer refusal because the court put the point in its own words: "California’s implied consent law (Veh. Code, § 13353). Appellant contends that the arresting officer did not afford him his statutory right to choose among alternative chemical tests. We conclude that the record refutes appellant’s position as a matter of law. Therefore we affirm." Use that passage as the starting point, then read the facts that precede it.
People v. Nzolameso
…agraph: Birchfield therefore prohibits a court from finding implied consent where an arrestee’s only choice is to consent to a warrantless blood test or be prosecuted for refusing to do so. Any consent obtained by law enforcement cannot be deemed valid where the only choice is consent to the blood test or be punished criminally. Here, however, that was not Nzolameso’s only choi…
On implied consent / breathalyzer refusal, People v. Nzolameso speaks to the California dispute in this passage: "Birchfield therefore prohibits a court from finding implied consent where an arrestee’s only choice is to consent to a warrantless blood test or be prosecuted for refusing to do so." The surrounding opinion shows how the court applied that language to the record.
Key takeaways
- Primary authority: Cal. Veh. Code § 23612.
- Administrative hit: A first refusal typically triggers a one-year DMV administrative license suspension (longer with priors), with a right to an administrative hearing if requested within the statutory window.
- Criminal exposure: Refusal can enhance the criminal DUI sentence and may support additional jail terms under § 23612.
- Evidence: Refusal is admissible in the criminal case and may be argued as consciousness of guilt; juries also hear about the chemical-test admonition.
- Blood vs. breath: federal Supreme Court doctrine in Birchfield and McNeely still frames warrant rules.
Implied consent in California
California drivers are deemed to consent to chemical testing of breath or blood when lawfully arrested for DUI under Vehicle Code § 23612. The officer must admonish the driver about the consequences of refusal.
Implied consent is not the same as a Miranda warning. Officers typically must advise of the consequences of refusal before requesting a chemical test. Failure to give a required advisory can affect whether the administrative suspension sticks — a frequent issue in California appellate opinions.
Frequently asked questions
What happens if I refuse a breathalyzer in California?
A first refusal typically triggers a one-year DMV administrative license suspension (longer with priors), with a right to an administrative hearing if requested within the statutory window. Refusal can enhance the criminal DUI sentence and may support additional jail terms under § 23612.
Is refusal a separate crime in California?
Refusal can enhance the criminal DUI sentence and may support additional jail terms under § 23612. Birchfield permits criminal penalties for breath refusal; blood draws for criminal punishment generally need a warrant.
Will the prosecutor tell the jury I refused?
Refusal is admissible in the criminal case and may be argued as consciousness of guilt; juries also hear about the chemical-test admonition.
Do I need a warrant for a blood draw?
Drivers usually choose breath or blood when both are available; if breath is refused, officers commonly seek a warrant for blood. Forced blood draws without a warrant are limited after Birchfield and Missouri v. McNeely. See also Birchfield and McNeely linked above.