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This portion examined objective signs, eye examinations and physiological indicators; and their relationship to the presence of THC. Several objective signs were excellent indicators of the presence of THC: red eyes (94%), droopy eyelids (85.6%), affected speech (87.6%), tongue coating (96.2%), and odor of marijuana (82.4%). About 63.6% of THC positive subjects had dialted pupils (room light). THC positive subjects had either rebound dilation or hippus in 88.8% of cases. Pulse and blood pressure (BP) were evaluated to determine any correlation with [THC]. An increased pulse rate correlated well to the presence of THC (88.5%), but not [THC]. BP did not correlate to [THC] and was also a poor indicator of THC in the blood (50% high).<\/jats:p>","DOI":"10.1111\/1556-4029.13550","type":"journal-article","created":{"date-parts":[[2017,6,20]],"date-time":"2017-06-20T07:43:11Z","timestamp":1497944591000},"page":"583-587","source":"Crossref","is-referenced-by-count":6,"title":["A Two\u2010Year Study of \u0394 9 Tetrahydrocannabinol Concentrations in Drivers; Part 2: Physiological Signs on Drug Recognition Expert (DRE) and non\u2010DRE Examinations,,"],"prefix":"10.1111","volume":"63","author":[{"given":"Kari","family":"Declues","sequence":"first","affiliation":[{"name":"Orange County Crime Lab in Orange County, California 320N Flower Santa Ana CA 92703"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shelli","family":"Perez","sequence":"additional","affiliation":[{"name":"Orange County Crime Lab in Orange County, California 320N Flower Santa Ana CA 92703"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ariana","family":"Figueroa","sequence":"additional","affiliation":[{"name":"Orange County Crime Lab in Orange County, California 320N Flower Santa Ana CA 92703"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2017,6,20]]},"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(accessed December 2016)."},{"key":"e_1_2_5_4_1","unstructured":"BerningA ComptonR WochingerK.Results of the 2013\u201014 national roadside survey of alcohol and drug use by drivers: traffic safety facts: research note.Washington DC:National Highway Traffic Safety Administration: US Department of Transportation 2015; Report No.: DOT HS 812 118."},{"key":"e_1_2_5_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1556-4029.2006.00239.x"},{"key":"e_1_2_5_6_1","unstructured":"U.S. Department of Transportation: National Highway Traffic Safety Administration.Drug Evaluation and Classification Training Program; The Drug Recognition Expert School \u2013 student manual. 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