Maui Business

Workplace Drug Tests Show Positivity Rate Is Up

January 6, 2020, 7:50 AM HST
* Updated January 6, 11:54 AM
Listen to this Article
1 minute
Loading Audio... Article will play after ad...
Playing in :00

Workplace drug testing results by Diagnostic Laboratory Services, Inc., showed increases in the positivity rate in the four major drug classes from Q3 to Q4 2019.

The amphetamines positivity rate is up 41.3 percent (from 0.80% to 1.13%), cocaine is up 47.4 percent (from 0.38% to 0.56%), opiates are up 100 percent (from 0.08% to 0.16%) and the THC (marijuana) positivity rate increased by 18.8 percent (from 2.76% to 3.28%).

“It is notable that the THC positivity rate is 3.28 percent. Although THC use has been close to 3.00 percent a number of times, this is the first time it’s over 3.00 percent. The positivity rate in workplace testing from a national survey was 2.8 percent in 2018, with a 17 percent increase since 2014. Although Diagnostic Laboratory Services’ data is slightly higher than the national survey, the national survey’s upward trend adds validity to our data,” said Dr. Steven Brimmer, Diagnostic Laboratory Services, Inc.’s director of Toxicology.

When comparing Q4 2019 to Q4 2018, the positivity rate in workplace testing of amphetamines, cocaine and THC increased by 72.8 percent, 39.8 percent and 12.7 percent, respectively. Opiate use decreased by 7.8 percent and synthetic urines rates dropped by 4.3 percent.

DLS’ quarterly sample size typically includes between 7,000 to 10,000 drug tests.


Diagnostic Laboratory Services, Inc. is a medical testing laboratory that offers a comprehensive range of routine and esoteric testing services and the most sophisticated forensic toxicology and substance abuse testing services in the State of Hawaiʻi. The company employs more than 700 people and has locations throughout Hawaiʻi, Saipan and Guam.

Lab file photo by Wendy Osher.

E-Mail Newsletters Receive daily or weekly updates via e-mail. Subscribe Now
News Alerts Breaking news alerts on your mobile device. Get the App


This comments section is a public community forum for the purpose of free expression. Although Maui Now encourages respectful communication only, some content may be considered offensive. Please view at your own discretion. View Comments