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New Hair Data Validate Sharp Downward Trend in Cocaine and Methamphetamine Positivity in General U.S. Workforce, According to Quest Diagnostics Drug Testing Index(TM)
Date:11/20/2009

MADISON, N.J., Nov. 20 /PRNewswire-FirstCall/ -- New data released today by Quest Diagnostics Incorporated (NYSE: DGX), the nation's leading provider of employment-related drug testing services, reveal that drug testing of hair specimens from employees and job applicants in the general U.S. workforce has tracked sharp downward trends in cocaine and methamphetamine use from 2005 to the first half of 2009 that mirror similar drops shown by urine testing. Data in the Quest Diagnostics Drug Testing Index(TM) (DTI) special report include more than 27 million urine tests and more than 840 thousand hair tests performed by Quest Diagnostics between 2005 and the first half of 2009. Testing of urine specimens can detect a single instance of drug use in the prior one to three days, while hair testing can detect a pattern of repetitive use over a period of up to 90 days.

Hair and urine test data show that declines in cocaine use have been dramatic since 2005, with hair tracking a 36 percent drop from 5.0 percent positivity to 3.2 percent positivity, and urine tracking a 57 percent drop from 0.70 percent positivity in 2005 to 0.30 percent positivity in the first half of 2009. A hair data decline of 55 percent in methamphetamine positivity rates, from 2.0 to 0.9 over the same period, validate the decline seen in urine test data, which fell 64 percent, from 0.28 to 0.10.

Numbers Fell Over Time, But Hair Data Show Far More Cocaine and Methamphetamine Use Than Urine Alone

While both hair and urine test data show a decline in cocaine and methamphetamine use over time in the general U.S. workforce, hair data show a dramatically higher level of use. In the first half of 2009, the 3.2 percent cocaine positivity rate in hair testing is more than ten-fold that of the 0.30 percent positivity found in urine testing, and
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SOURCE Quest Diagnostics Incorporated
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