Our Team

Alexander B. Perez

Roland B. Perez

Roger Bacud

Hank Greenberg

INDEPENDENT EXPERT is retained on a case by case basis to provide an independent comprehensive review and evaluation relating to both advantages and disadvantages to related matters. An example of an independent expert retained by Perez & Perez as well as others non-exclusively:

Hank Greenberg

Forensic Criminalist, Toxicologist and State-Certified Forensic Alcohol Supervisor

A Forensic Criminalist, Toxicologist and State-Certified Forensic Alcohol Supervisor. He is retained, on a case-by-case basis, in the evaluation of blood or breath BAC evidence in DUI & DMV Cases.



     University of Michigan, Ann Arbor
Masters of Science, Medicinal Chemistry, 1971


     Nasson College, Springvale, Maine
Bachelor of Arts, Cum Laude, Chemistry, 1970


1986 - Present

     Consultant on blood alcohol analysis and related issues. Retained and court-qualified as an expert witness in criminal litigation before Courts in California, and at Administrative Hearings before California's Department of Motor Vehicles. Director and owner of Forensic Analytical Consultants, a California licensed forensic alcohol laboratory and consulting service.

Forensic Alcohol Supervisor, re-certified 1987;

NHTSA certification in Field Sobriety Testing theory, administration and analysis;

Drug Alcohol Recognition Training Program (D.A.R.T.); and

Intoximeter Factory Training, July 2000, in theory, operation and repair of Alco-Sensor/RBT and EC/IR breath testing devices.

1973 - 1986

     Los Angeles County Sheriff's Department
Criminalistics Laboratory

Senior Criminalist:
  • Assistant Leader, Blood Alcohol Section, 1980 - 1986
  • Forensic Alcohol Supervisor, certified 1980
  • Forensic Alcohol Analyst, certified 1974

    Trained in theory, operation and repair of Gas-Chromatograph, Breathalyzer, Intoxilyzer, Intoximeter, Alco-Analyzer and Alco-Sensor;

    Supervised preparation and qualification of breath testing machine blood alcohol referencing solutions;

    Provided training to law enforcement officers, prosecutors and laboratory staff in breath testing and blood analytical procedures;

    Maintained breath testing accuracy, usage and solution-testing records; and

    Trained in Serology, Toxicology and Narcotics.


           American Association of Clinical Chemistry California Association of Criminalistics Canadian Society of Forensic Science International Narcotic Officers Association Southwestern Association of Forensic Scientists


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