Citation

Samyn N, De Boeck G, Verstraete AG. J. Forensic Sci. 2002; 47(6): 1380-1387.

Affiliation

National Institute of Criminalistics and Criminology, Brussels, Belgium. nele.samyn@just.fgov.be

Copyright

(Copyright © 2002, American Society for Testing and Materials, Publisher John Wiley and Sons)

DOI

unavailable

PMID

12455668

Abstract

Blood, urine, oral fluid (by spitting or with a Salivette), and sweat samples (by wiping the forehead with a fleece moistened with isopropanol) were obtained from 180 drivers who failed the field sobriety tests at police roadblocks. With quantitative GC-MS, the positive predictive value of oral fluid was 98, 92, and 90% for amphetamines, cocaine, and cannabis respectively. The prevalence of opiate positives was low. The proposed SAMHSA cut-off values for oral fluid testing at the workplace, proved their usefulness in this study. The positive predictive value of sweat wipe analysis with GC-MS was over 90% for cocaine and amphetamines and 80% for cannabis. The accuracy of Drugwipe was assessed by comparing the electronic read-out values obtained on-site after wiping the tongue and the forehead, with the corresponding GC-MS results in plasma, oral fluid, and sweat. The accuracy was always less than 90% except for the amphetamine-group in sweat.

Language: en