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Ask the Experts

Ask the experts: Secondhand marijuana smoke

May 11, 2021

Can you fail a drug test from secondhand smoke? There are no published, peer-reviewed studies to date that indicate someone would test positive on a drug test due to incidental exposure of marijuana smoke. Learn more from Dr. Barry Sample, Quest Diagnostics.

Urine testing

Thwarting drug test cheaters

May 4, 2021

There are safeguards to help employers prevent a job applicant or employee who uses drugs from cheating or altering a drug test. Learn more.

Hair testing

Ask the experts: Hair testing vs. hair follicle testing

April 27, 2021

What is the difference between hair drug testing and hair follicle drug testing? We asked a Quest expert to explain.

News

Celebrating Lab Week

April 19, 2021

Every April, we honor our lab professionals during Lab Week. Their work makes helps to keep our workplaces safe and drug-free.

News

Challenging the poppy seed defense

April 13, 2021

A Quest Diagnostics study helps to answer the question: Can eating poppy seeds produce a positive drug test for a job applicant or employee?

Hair testing

Ask the experts: Effects of hair treatments on drug test results

April 6, 2021

Our scientific expert, Dr. Barry Sample, answers the question: Can products and treatments affect hair drug test results?

Ask the Experts

Ask the experts: The life of a drug testing specimen

March 23, 2021

Our labs handle more than eight million drug testing specimens yearly while maintaining an excellent track record of reliability and accuracy.

Hair testing

Common questions about hair testing

March 9, 2021

An expert from Quest Diagnostics answers some of the most common questions about hair drug testing.

White Papers

The new age of marijuana white paper

February 23, 2021

This white paper aims to shed light on the drug, its legal classification, and the importance of drug testing in the workplace.

Drug Testing

Would-be cheaters bet on synthetic urine

February 9, 2021

One popular way that an individual attempts to cheat a urine drug test is synthetic urine. Learn more about safeguards offered by trained collectors at Quest Diagnostics.