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DUI Defense Experts

Alan McCann
Accident Reconstruction ExpertMr. McCann works as an accident reconstruction and investigation expert for the Law Office of Robert Tayac. Prior to joing the Law Office of Robert Tayac, Mr. McCann spent 33 years with the San Francisco Police Department. Mr. McCann has conducted over 1,000 driving under the influence of alcohol or drugs investigations and made over 600 DUI arrests. The San Francisco Police Department awarded Mr. McCann their highest honor, the Gold Medal of Valor. Additionally, Mr. McCann holds basic, intermediate, advanced POST Certificates (Peace Officer’s Standards and Training).

Halle Weingarten
DUI Forensics ExpertHalle Weingarten is a consultant in forensics. She provides comprehensive case review, including evaluation of the role of alcohol and drugs in case specific context, effects and metabolism of these substances, assessment of the reliability of alcohol and drug test procedures, evidence handling procedures, regulatory compliance, and quality assurance to the Law Office of Robert Tayac. Ms. Weingarten provides expert testimony in criminal, administrative, and civil proceedings. Additionally, Ms. Weingarten assists laboratories in setting up analytical methods that meet regulatory and legal requirements and in training laboratory staff and law enforcement officers.

Ms. Weingarten holds the following certifications:
American Board of Forensic Toxicology Forensic Alcohol Supervisor, Diplomate, Certified Forensic Toxicologist, California Department of Health Services Intoxilyzer 5000, Operation and Maintenance, Certified Professional Collector Trainer, Drug and Alcohol Testing Industry Association, Certificate of Completion of Standardized Field Sobriety Test (SFST) Training, 2007. California Department of Health Services Clinical Toxicologist Technologist, CMI, Inc., Breath Alcohol Technician Instructor (certified to train trainers and technicians), CMI, Inc. Breath Alcohol Technician, CMI, Inc. (Intoxilyzer 200, 400, 5000) Breath Alcohol Technician Trainer, Intoximeters, Inc. Breath Alcohol Technician Trainer, MedExpress Toxicology, Inc.

Paul Cavallero
DUI InvestigatorInvestigator Paul Cavallero has conducted over 200 DUI investigations. Mr. Cavallero has been a member of the Law Office of Robert Tayac for over 3 years and is responsible for photographing arrest locations, delivering client motions to all Bay Area county courthouses, and gathering client discovery. He regularly testifies in court as a witness on behalf of the firm’s clients.

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