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Marijuana use in the workplace drops 7 percent in 2013

By Kristen Consillio

LAST UPDATED: 12:20 p.m. HST, Jan 07, 2014

<br />Marijuana is displayed during the grand opening of the Seattle location of the Northwest Cannabis Market, for sales of medical marijuana products, Wednesday, Feb. 13, 2013. The market hosts nine permanent vendors for seven-day-a-week sales, as well as daily vendors of a variety dried medicines, edible products and starts. Voters in Washington state last fall passed Initiative 502, which legalizes the recreational possession of up to an ounce of marijuana and calls for the creation of state-licensed pot growers, processors and retail stores. Recreational marijuana sales are expected to begin late this year, and in the meantime, the state's medical marijuana industry continues to operate. (AP Photo/Elaine Thompson)<br />

Hawaii workers testing positive for marjiuana dropped 7 percent in 2013 compared with the previous year, new data from Diagnostic Laboratory Services Inc. shows. 

The use of marijuana, known locally as pakalolo, fell 11.5 percent year-over-year in the fourth quarter.

The drug-testing company said methamphetamine use in the workplace also declined 11 percent year-over-year in the quarter, but the entire year was essentially flat compared with 2012. Coke and opiate use also remained about the same over the past year.

 "The most dramatic change was in the use of synthetic urine, which dropped precipitously by 30 percent from last year," Carl Linden, DLS' scientific director of toxicology, said in a statement.

 The use of synthetic urine to mask drug use in tests has been dropping since the laboratory started using a new detection method in 2010. Samples that do not contain drugs, but show that synthetic urine was used, are deemed invalid requiring new samples.

 DLS' quarterly sample size typically includes between 7,000 and 10,000 drug tests.

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