Drug Testing

As San Jose’s premier service provider, DNA & Drug Screening Services offers drug testing panels ranging from the three most commonly abused drugs to panels that include all testable drugs of abuse, including the latest drug trends such as “bath salts” and synthetic “spice / k2” marijuana.  Our partnership drug testing laboratories are the industry’s best, each certified or accredited by our industry’s most prestigious regulatory bodies.

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Alcohol Testing

Bio-Med Testing/Wienhoff Drug Testing/DNA & Drug Screening Services is proud to be an authorized dealer of Lifeloc Technologies evidential breath testing equipment and employ two Lifeloc Master Trainers.  We operate a renowned training program for breath alcohol technicians and are widely regarded as experts in the breath-testing field.

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DNA & Drug Screening Services offers multiple training programs for any company who has a drug-free workplace program, DOT or non-DOT, and industry trainings for companies who perform drug testing collection services.



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Welcome to DNA and Drug Screening Services

DNA Drug Screening Services is a national company that was founded in San Jose, California in 1989 and is owned by Colleen Wienhoff, a nationally recognized expert in drug testing with over 28 years in the industry.  Our dedicated staff of friendly professionals is always eager to help our clients.

Of primary focus to us is DOT compliance.  Our knowledge of and strict adherence to DOT standards in administering testing programs has situated us as industry leaders and experts.

With over 3000 client companies, DNA Drug Screening Services is California’s most trusted drug testing program administrator.  Our clients include large and small municipalities, State agencies and private companies from all industries.

Our parent company is Wienhoff Drug Testing of Boise, Idaho; our sister company is Bio-Med Testing Services, Inc. of Salem, Oregon.