Latest Posts

Drug Testing

Avoid testing delays – transition to the new DOT CCF

June 3, 2021 By

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.

Ask the Experts

Ask the Experts: Drug testing cutoffs

June 15, 2021 By

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

Webinars

Webinar: Cannabis and the workplace

June 1, 2021 By

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

Drug Testing

Drug positivity rates continue at historically high levels

May 26, 2021 By

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

Hair testing

Ask the Experts: Hair drug test collections

May 18, 2021 By

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.

Ask the Experts

Ask the experts: Secondhand marijuana smoke

May 11, 2021 By

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 By

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 By

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 By

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 By

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