Exposing the Unreliable: How Attorney Matthew Ruff Victory Against Defective DMV Breath Test Evidence
When facing a DUI charge in Southern California, many drivers assume that a chemical test reading over the legal limit automatically means game over. However, official-looking numbers on a breathalyzer output sheet do not guarantee that law enforcement followed proper procedure or that the evidence is scientific truth.
A recent California Department of Motor Vehicles (DMV) Administrative Per Se case handled by top Manhattan Beach DUI Lawyer Matthew Ruff proves exactly why challenging the prosecution’s evidence is vital. In this case, Attorney Ruff successfully exposed systemic flaws in police training and evidence collection, forcing the DMV to completely set aside a license suspension despite recorded Breath Alcohol Concentration (B.A.C.) levels as high as 0.25%.
The Details of the Incident
Following an arrest on March 16 for an alleged violation of California Vehicle Code Section 23152, the driver submitted to two breath tests at 12:15 AM and 12:18 AM. The testing device logged B.A.C. results of 0.25% and 0.23%—nearly three times the legal threshold of 0.08%.
On paper, the prosecution appeared to have an airtight case. However, Attorney Matthew Ruff conducted a rigorous defense investigation, probing beyond the initial paperwork into the officer’s actual qualifications and adherence to state regulations.
Uncovering Misconduct and Title 17 Violations
During the administrative proceedings, Attorney Ruff cross-examined the arresting officer regarding the breath testing procedures. Through precise questioning, he uncovered critical flaws in how the Manhattan Beach Police Department handled the breath testing device:
- Lack of Formal Device Training: Officer Mitchell admitted under testimony that while he had received general training on a similar breath testing device, he had never received formal training on the specific DataMaster cdm device used during this arrest.
- Failure to Read Operating Manuals: The officer testified that his sole preparation for operating the DataMaster device was a quick, one-time walkthrough conducted by another Manhattan Beach Police officer a year prior. He admitted that he had never even read the device’s operational manual.
- Title 17 Regulatory Non-Compliance: California Code of Regulations Title 17 sets strict rules for administering chemical tests to ensure accurate, scientifically valid results. Because the officer lacked proper training and failed to follow required procedures, the reliability of the 0.25% B.A.C. reading was entirely compromised.
The Verdict: Total Set Aside
Faced with the evidence brought to light by “Master of DUI Defense”, Matthew Ruff, Driver Safety Officer L. Nesby issued a decisive ruling:
“As a result of the preceding finding the administrative action against Respondent’s driving privilege cannot be upheld in this case… suspension of your driving privilege is hereby set aside.”
The DMV officially ruled that because the officer lacked the mandatory training required to properly operate the device, the chemical test evidence could not be trusted. The suspension was completely dropped, and the client’s driving privileges were restored.

Why Having an Experienced South Bay DUI Attorney Matters
This case highlights a crucial truth in criminal and administrative defense: police officers make mistakes, and breath machines are only as reliable as the people operating them. Without an attorney who thoroughly understands Title 17 regulations, breathalyzer mechanics, and police procedures, critical errors like these often go unnoticed.
Matthew Ruff, DUI Attorney in Manhattan Beach, brings over 30 years of local experience to the table, consistently holding law enforcement agencies accountable and protecting the constitutional rights of his clients in Manhattan Beach, Torrance, Redondo Beach, and across Los Angeles County.
Facing a DUI Charge or DMV License Suspension? Do not assume your case cannot be won. Contact the Law Office of Matthew Ruff today for a direct consultation.
- Direct Phone: (310) 527-4100
- Cell / Text: (310) 686-1533
- Office Location: 18411 Crenshaw Blvd, Torrance, CA 90504