Common questions about hair testing

March 9, 2021 By

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

January 5, 2021 By

Quest Diagnostics is the only SAMHSA-certified and CAP-FDT-accredited laboratory to offer in-house testing for all three of the most popular drug test types: urine, oral fluid, and hair.
Comprehensive drug testing solutions

December 15, 2020 By

Drug testing can be complicated, but it doesn’t have to be. We can help employers choose the elements that are most valuable for their employees.
New insights from the National Survey on Drug Use and Health

December 8, 2020 By

It is important for employers to examine trends and data, such as NSDUH, that helps to inform a workforce drug testing program.
Marijuana positivity in America’s workplace

September 15, 2020 By

Data shows increases in marijuana positivity rates across workforce categories, drug test specimen types, and regions in the United States.
Drug use rises again in the American workforce

August 25, 2020 By

Drug positivity in 2019 hit a 16-year high in the US workforce, according to the latest Quest Diagnostics Drug Testing Index.
Ask the experts: Is an oral fluid drug test safe?

June 9, 2020 By

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.
Electronic breath alcohol test (eBAT) now available

May 26, 2020 By

With an expanding collection site network, electronic breath alcohol testing, or eBAT, from an industry leader is now a reality.
Drug test collections during the COVID-19 emergency

April 7, 2020 By

Quest Diagnostics continues to provide workplace drug and alcohol testing solutions while working to maintain a safe environment for donors and employees.
Marijuana frequently asked questions

January 7, 2020 By

Whether it is about its legal status, its side effects, or if employers can drug test employees, questions are plentiful about marijuana. We’ve answered some of the most frequently asked questions to help you sift through the noise and get a true sense of the current state of marijuana.

Latest posts

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?

Hair testing

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

April 6, 2021 By

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 By

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