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Citation |
Declues K, Perez S, Figueroa A. J. Forensic Sci. 2018; 63(2): 583-587. |
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Affiliation |
Orange County Crime Lab in Orange County, California, 320N Flower, Santa Ana, CA, 92703. |
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Copyright |
(Copyright © 2018, American Society for Testing and Materials, Publisher John Wiley and Sons) |
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DOI |
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PMID |
28631315 |
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Abstract |
Whole blood samples were examined for ∆(9) -Tetrahydrocannabinol (THC) over 2 years in drivers suspected of driving under the influence. Part one of the study examined the link between [THC] and performance on field sobriety tests. 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). Language: en |
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Keywords |
Drug Recognition Expert; dilated pupils; driving under the influence of drugs; forensic science; marijuana; physiological signs; rebound dilation |