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WSP Report: 1312 Full Year THC Tests

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  February 18, 2014 Dr. Fiona Couper, State Toxicologist fiona.couper@wsp.wa.gov Analysis of suspected impaired driving cases (DUI & DRE) received at the Washington State Toxicology Laboratory (statewide data from blood results). Table 1: Percentage of total driving cases confirming positive for THC (delta-9-THC) Year Total # of impaired driving cases received for testing Percentage of total cases testing positive for THC 2009 4,809 18.2 % 2010 5,012 19.4 % 2011 5,132 20.2 % 2012 5,298 18.6 % 2013 5,468 24.9 % Table 2: Percentage of total driving cases confirming positive for carboxy-THC (metabolite of THC, indicates marijuana use) Year Total # of impaired driving cases received for testing Percentage of total cases testing positive for carboxy-THC 2009 4,809 26.3 % 2010 5,012 28.2 % 2011 5,132 28.4 % 2012 5,298 28.6 % 2013 5,468 40.0 % Notes on Tables 1 and 2: - The cases in Table 1 are a subset of Table 2. For example, in 2013 there were 2,187 cases (40%) that confirmed positive for carboxy-THC … of which 1,362 cases (24.9%) also confirmed positive for THC - In previous years, the reportable level for THC was 1 ng/mL and higher. In 2013, THC was only reported at concentrations of 2 ng/mL and higher - Although there have been internal procedural changes with respect to drug testing, the observed increase is still apparent and similar after the data is normalized (i.e. after accounting for changes) - Typically, one quarter of those cases confirming positive for THC are aged under 21 years - Marijuana is the most frequently detected drug in those aged under 21 years (this includes alcohol)  February 18, 2014 Dr. Fiona Couper, State Toxicologist fiona.couper@wsp.wa.gov Graph 1: Data from Tables 1 and 2 shown in graphical form Solid (red) line – Percentage of impaired driving cases positive for carboxy-THC Dashed (blue) line – Percentage of impaired driving cases positive for delta-9-THC Table 3: Number of THC positive driving cases at or above the per se 5 ng/mL Year # of impaired driving cases positive for delta9-THC # of these cases where THC is BELOW 5 ng/mL # (%) of these cases where THC is 5 ng/mL or higher 2011 1,036 530 506 (49%) 2012 988 378 610 (62%) 2013 1,362 642 720 (53%) Table 4: Summary of THC blood concentrations from driving cases Year # cases positive for delta9-THC THC concentration Range Average THC concentration Median THC concentration 2011 1,036 1 - 58 ng/mL 6.4 ng/mL 4.8 ng/mL 2012 988 1 - 90 ng/mL 8.0 ng/mL 6.2 ng/mL 2013 1,362 2 - 77 ng/mL 7.2 ng/mL 5.2 ng/mL   0.0% 10.0% 20.0% 30.0% 40.0% 50.0% 2009 2010 2011 2012 2013 Marijuana-related driving cases (%)

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Jul 23, 2017
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