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The goal of this study was to examine police reports and drug recognition expert evaluations of <jats:styled-content style=\"fixed-case\">THC<\/jats:styled-content>\u2010positive samples within this 2\u2010year time frame to determine whether there is a correlation between whole\u2010blood <jats:styled-content style=\"fixed-case\">THC<\/jats:styled-content> concentrations and field sobriety tests performance on <jats:styled-content style=\"fixed-case\">DRE<\/jats:styled-content> and non\u2010<jats:styled-content style=\"fixed-case\">DRE<\/jats:styled-content> evaluations. The <jats:styled-content style=\"fixed-case\">FST<\/jats:styled-content>s prove to be sensitive to impairment by marijuana although as suspected, the findings of this study did not find a correlation between performance on field sobriety tests and the concentration of <jats:styled-content style=\"fixed-case\">THC<\/jats:styled-content> tested in whole\u2010blood samples. Driving behaviors were also examined and found to be similar to those seen in alcohol impairment. Future studies examining <jats:styled-content style=\"fixed-case\">DRE<\/jats:styled-content> findings are needed to confirm the results.<\/jats:p>","DOI":"10.1111\/1556-4029.13168","type":"journal-article","created":{"date-parts":[[2016,8,2]],"date-time":"2016-08-02T18:01:56Z","timestamp":1470160916000},"page":"1664-1670","source":"Crossref","is-referenced-by-count":17,"title":["A 2\u2010Year Study of \u0394 9\u2010tetrahydrocannabinol Concentrations in Drivers: Examining Driving and Field Sobriety Test Performance,,"],"prefix":"10.1111","volume":"61","author":[{"given":"Kari","family":"Declues","sequence":"first","affiliation":[{"name":"The Orange County Crime Lab 320 North Flower Santa Ana CA 92703"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shelli","family":"Perez","sequence":"additional","affiliation":[{"name":"The Orange County Crime Lab 320 North Flower Santa Ana CA 92703"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ariana","family":"Figueroa","sequence":"additional","affiliation":[{"name":"The Orange County Crime Lab 320 North Flower Santa Ana CA 92703"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2016,8]]},"reference":[{"key":"e_1_2_5_2_1","doi-asserted-by":"publisher","DOI":"10.15288\/jsad.2011.72.567"},{"key":"e_1_2_5_3_1","unstructured":"http:\/\/www.drugabuse.gov\/publications\/drugfacts\/nationwide-trends"},{"key":"e_1_2_5_4_1","volume-title":"2007 National roadside survey of alcohol and drug use by drivers: drug results","author":"Lacey JH","year":"2009"},{"key":"e_1_2_5_5_1","volume-title":"Drugged driving expert panel report: a consensus protocol for assessing the potential of drugs to impair driving","author":"Kay GG","year":"2011"},{"key":"e_1_2_5_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1556-4029.2006.00239.x"},{"key":"e_1_2_5_7_1","volume-title":"Marijuana, alcohol and actual driving performance","author":"Robbe HWJ","year":"1999"},{"key":"e_1_2_5_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.drugalcdep.2006.03.015"},{"key":"e_1_2_5_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pscychresns.2010.10.002"},{"key":"e_1_2_5_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.drugalcdep.2003.10.008"},{"key":"e_1_2_5_11_1","doi-asserted-by":"publisher","DOI":"10.1136\/bmj.e536"},{"key":"e_1_2_5_12_1","doi-asserted-by":"publisher","DOI":"10.1373\/clinchem.2012.194381"},{"key":"e_1_2_5_13_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0043496"},{"key":"e_1_2_5_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0001-4575(02)00153-7"},{"key":"e_1_2_5_15_1","volume-title":"Drug evaluation and classification training program: the drug recognition expert school \u2013 student manual","author":"U.S. Department of Transportation: National Highway Traffic Safety Administration","year":"2007"},{"key":"e_1_2_5_16_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0379-0738(02)00384-5"},{"key":"e_1_2_5_17_1","volume-title":"Final report to Office of Highway Safety, State of California. 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