Category: Blog Series

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

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.

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

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

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

As drug use continues to rise, it is more important than ever to combine pre-employment testing with a random drug testing program.

New research from the United Nations Office on Drugs and Crime (UNODC) examines drug production and raw materials, drug trafficking amongst border restrictions, and individual drug consumption while quarantined.

In this edition of "By the Numbers," we look at the numerical values that enable our Customer Support team to serve our customers effectively.

During the novel coronavirus health crisis, many employers ask is if an oral fluid drug test is safe in the current circumstances. Under rigorous safety procedures, drug testing continues across the country.