Latest Posts
Ask the experts: Secondhand marijuana smoke
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.
Thwarting drug test cheaters
There are safeguards to help employers prevent a job applicant or employee who uses drugs from cheating or altering a drug test. Learn more.
Ask the experts: Hair testing vs. hair follicle testing
What is the difference between hair drug testing and hair follicle drug testing? We asked a Quest expert to explain.
Celebrating Lab Week
Every April, we honor our lab professionals during Lab Week. Their work makes helps to keep our workplaces safe and drug-free.
Challenging the poppy seed defense
A Quest Diagnostics study helps to answer the question: Can eating poppy seeds produce a positive drug test for a job applicant or employee?
Ask the experts: Effects of hair treatments on drug test results
Our scientific expert, Dr. Barry Sample, answers the question: Can products and treatments affect hair drug test results?
Ask the experts: The life of a drug testing specimen
Our labs handle more than eight million drug testing specimens yearly while maintaining an excellent track record of reliability and accuracy.
Common questions about hair testing
An expert from Quest Diagnostics answers some of the most common questions about hair drug testing.
The new age of marijuana white paper
This white paper aims to shed light on the drug, its legal classification, and the importance of drug testing in the workplace.
Would-be cheaters bet on synthetic urine
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.