How to Challenge DUI Blood Test Results in California: Title 17 Violations, Lab Errors, and Your Rights

Can a California DUI blood test be challenged?

What Title 17 covers

California’s forensic alcohol regulations address the collection, handling, analysis, and retention of samples. Title 17 section 1219 requires preservation of sample identity and integrity. Section 1219.1 addresses blood collection, including collection equipment, skin disinfectants, use of an anticoagulant and preservative, and retention of the remaining sample. It does not name one mandatory brand of collection tube or guarantee that every procedural deviation changes a result.

The California Department of Public Health publishes the forensic alcohol regulations and information about its Forensic Alcohol Laboratory Program. Counsel should check the rules applicable to the collection and analysis in the particular case.

Which records should be reviewed?

The reported number is only part of the evidence. Questions for a blood-test review include:

• Collection: Who drew the sample, when was it drawn, and what collection materials and procedures were documented?
• Identity and custody: Do the labels, seals, transfers, and laboratory records consistently identify the same sample?
• Storage and handling: What do the records show about the time between collection and testing and the sample’s condition?
• Analysis: What method was used, what quality-control records accompany the run, and were there reported irregularities?
• Interpretation: What assumptions connect the test result to the time of driving and the charged offense?

This is a review checklist, not a claim that any particular laboratory made an error. A qualified forensic expert can help determine whether an identified issue matters to the reliability or interpretation of the result.

Timing and the blood alcohol level at driving

Vehicle Code section 23152(b) concerns driving with a blood alcohol concentration of 0.08% or more. It also provides a rebuttable presumption for a qualifying chemical test within three hours of driving. That presumption matters: it is inaccurate to say a later test is automatically irrelevant simply because it was not taken behind the wheel.

An attorney and toxicologist can assess whether the actual timeline and evidence support a different interpretation. A generic absorption timetable or an online alcohol calculator cannot establish a person’s earlier concentration. Read Vehicle Code section 23152.

Alcohol concentration and a drug-related DUI allegation also raise different questions. See our drug DUI defense page for that distinction.

Independent testing and preservation

Ask counsel promptly about preserving the remaining sample and arranging an independent analysis. Title 17 section 1219.1 addresses retention and providing a portion to the defendant when sufficient sample remains. Do not assume that a separate defense vial was automatically prepared at the original draw.

A retest must be considered with the collection, storage, analytical methods, and other evidence. If material is missing or degraded, the appropriate legal remedy requires a separate analysis; exclusion is not automatic. California v. Trombetta discusses constitutional preservation duties.

If testing followed an alleged refusal, also review the chemical-test refusal checklist. Keep the testing timeline and DMV notices together for counsel.

Was the blood draw lawfully obtained?

A blood draw raises Fourth Amendment issues. Counsel may examine a warrant, the circumstances of consent, or an asserted exception to the warrant requirement. In Birchfield v. North Dakota, the Supreme Court distinguished blood tests from breath tests in the search-incident-to-arrest context. The decision does not make every warrantless blood draw unlawful.

Refusal allegations also require attention to the actual warnings, response, and testing circumstances. See DMV hearing defense; the administrative licensing process is separate from the criminal case.

Discuss the evidence with JackDUI

Bring the lab report if you have it, along with the citation, DMV notice, and a factual timeline. JackDUI serves Glendale, Pasadena, Burbank, and Los Angeles. Request a free consultation to discuss what records and legal issues need review. The result of a case depends on its evidence and applicable law.