Marijuana, Other Drugs, and Alcohol Use by Drivers in Washington State: Appendices

Ramirez, Anthony; Berning, Amy; Carr, Katherine; Scherer, Michael; Lacey, John H.; Kelley-Baker, Tara; Fisher, Deborah A.; Pacific Institute for Research and Evaluation

doi:10.21949/1525829

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Marijuana, Other Drugs, and Alcohol Use by Drivers in Washington State: Appendices

2016-07-01
By Ramirez, Anthony ; Berning, Amy ; Carr, Katherine ; ...
Series: Roadside and Crash Risk Studies

[PDF-1.53 MB]

English

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Details:

Creators:

Ramirez, Anthony ; Berning, Amy ; Carr, Katherine ; Scherer, Michael ; Lacey, John H. ; ... More +

Ramirez, Anthony ; Berning, Amy ; Carr, Katherine ; Scherer, Michael ; Lacey, John H. ; Kelley-Baker, Tara ; Fisher, Deborah A. Less -
Corporate Creators:

Pacific Institute for Research and Evaluation
Corporate Contributors:

United States. Department of Transportation. National Highway Traffic Safety Administration. Office of Behavioral Safety Research ; Insurance Institute for Highway Safety

United States. Department of Transportation. National Highway Traffic Safety Administration. Office of Behavioral Safety Research ; Insurance Institute for Highway Safety Less -
Subject/TRT Terms:

[+]

Alcohol-involved Driving Alcohol And Driving Alcohol Use Before And After Studies Cannabis Data Collection Drug-involved Driving Drugged Driving Drugs And Driving Drug Use Impaired Drivers Impaired Driving Legalization Marijuana Night Roadside Survey Testing THC Washington State
Publication/ Report Number:

DOT HS 812 299
Series:

Roadside and Crash Risk Studies
DOI:

https://doi.org/10.21949/1525829
Resource Type:

Tech Report
Geographical Coverage:

Washington
Corporate Publisher:

United States. National Highway Traffic Safety Administration. Office of Behavioral Safety Research
Abstract:

In Washington State legal sales of marijuana began July 8, 2014. A voluntary, anonymous roadside study was conducted to assess the prevalence of drivers testing positive for alcohol and other drugs, including marijuana, on Washington’s roads. Data was collected in three waves, before implementation of legal sales, about 6 months after implementation, and 1 year after implementation. Of the almost 2,400 participants who provided an oral fluid or blood sample, 14.6 percent of drivers, 19.4 percent of drivers, and 21.4 percent of drivers were THC-positive in Waves 1, 2, and 3, respectively. There were no statistically significant differences between waves. There was a statistically significant increase in daytime prevalence of THCpositive drivers between Wave 1 (7.8%) and Wave 2 (18.4%), and also between Wave 1 and Wave 3 (18.9%). There was an increase in the percentage of THC-positive nighttime drivers with each successive wave, but these increases were not statistically significant. Synthetic marijuana was found in only 2 of the participants.
Format:

PDF
Funding:

DTNH22-11-D-00226-0004
Collection(s):

NHTSA - Behavioral Safety Research
Main Document Checksum:

[+]

urn:sha256:7f5824186ce8acc26da3896e2757fc7884c85838dc820f66698c82157ecffcf8
Download URL:

https://rosap.ntl.bts.gov/view/dot/2010/dot_2010_DS1.pdf
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No Additional Files

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Marijuana, Other Drugs, and Alcohol Use by Drivers in Washington State: Appendices

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