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Current DOT CCFs are expiring soon. Proactively prepare for this change and double-check your paper CCF inventory today. Act now to avoid testing delays.

Employers should carefully select a drug test specimen type and cutoff level based on the desired window of detection and regulatory requirements.

Our webinar helps employers navigate the complexities of cannabis and the workplace. Register today and learn how to better navigate this complex topic.

Marijuana positivity continues double-digit increases to keep overall drug positivity at historically high levels, according to the latest Quest Diagnostics Drug Testing Index.

The amount of hair needed for a hair drug test is approximately 100 milligrams made up of the first 1-½ inches from the root end. The hair is typically cut from the crown of the back of the head in a manner where it will not be as noticeable. Learn more about hair drug test collections.

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.

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

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

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

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