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NCJRS Abstract

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NCJ Number: 225531 Add to Shopping cart Find in a Library
Title: Analysis of Cocaine Analytes in Human Hair: Evaluation of Concentration Ratios in Different Hair Types, Cocaine Sources, Drug-User Populations, and Surface-Contaminated Specimens
Author(s): Jeri D. Ropero-Miller; Peter R. Stout
Corporate Author: RTI International
United States of America
Date Published: November 2008
Page Count: 106
Sponsoring Agency: National Institute of Justice (NIJ)
Washington, DC 20531
National Institute of Justice/NCJRS
Rockville, MD 20849
NCJRS Photocopy Services
Rockville, MD 20849-6000
RTI International
Research Triangle Park, NC 27709
Grant Number: 2006-DN-BX-K019
Sale Source: National Institute of Justice/NCJRS
Box 6000
Rockville, MD 20849
United States of America

NCJRS Photocopy Services
Box 6000
Rockville, MD 20849-6000
United States of America
Document: PDF
Type: Report (Technical)
Format: Document
Language: English
Country: United States of America
Annotation: This research evaluated the effects of cocaine (COC) composition, COC incorporation by ingestion and external contamination, and hair color (light and dark hair) on COC analytes and analyte-to-parent ratios found in hair.
Abstract: The research concluded that the use of cut-off concentrations for any or all of the COC analytes would not be sufficiently reliable to discriminate a COC user’s hair from a nonuser’s hair contaminated with COC from the environment. The use of analyte ratios provides more information and some ability to discriminate user specimens from contaminated specimens; however, the use of cocaethylene (CE) and norcocaine (NCOC) concentrations and ratios does not discriminate any more efficiently than decision criteria using only benzoylecgonine (BE) and COC. All three analytes (CE, NCOC, and BE) can be present in varied concentrations in illicit COC as byproducts of the manufacturing process, which will confound the use of ratios in discriminating contaminated hair from user hair. Even after decontaminating the hair, the application of concentration and ratio decision points did not adequately discriminate contamination from drug use. These results have implications for the proposed Federal Mandatory Guidelines for laboratory testing, because the decision criteria as proposed in this study do not adequately discriminate contamination. This is of particular concern for individuals whose occupation (e.g., law enforcement) may put them in contact with large amounts of COC in their environment, which can then be transferred to samples of tested hair. A requirement for decontamination and further research are needed in order to determine the viability of comparative criteria using information from the decontamination. The study methodology involved the evaluation of COC and COC analyte concentrations and ratios in user hair from various populations, hair contaminated with various sources of COC, and an alternate external application of COC to hair (fortification). 18 figures, 31 tables, 62 references, a listing of publication and presentation on the findings, and appended detailed data on user population and contaminated hair
Main Term(s): Drug analysis
Index Term(s): Cocaine; Decontamination; Drug detection; Environmental influences; Hair and fiber analysis; Investigative techniques; NIJ final report
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