Abstract
The presence of cocaine in illicit drug samples is still being determined in some laboratories using spot tests and microcrystal tests. Seventeen chemical species were tested using three different spot tests (Wagner, Marquis, and cobalt thiocyanate followed by stannous chloride reactions) and two microcrystal tests (gold chloride and platinic chloride) to determine whether the results could be differentiated from the results of these tests on cocaine. The data obtained indicated that nine of the 17 compounds gave results similar to those from cocaine using the three spot tests, but that the results from microcrystal testing allowed for differentiation of all nine compounds from cocaine.
Issue Section:
Technical Notes
References
1.
De Forest
PR
. Letters to the Editor. Microscope
1988
:36
373
–81
.2.
SWGDRUG Methods and Reports Subcommittee Recommendations
, Recommended Minimum Standards for Forensic Drug Identification
, http://www.swgdrug.org.3.
Nichols
RG
. Drug proficiency test false positives: a lack of critical thought
. Science & Justice
1355-0306 1997
;37
(3
):191
–6
.4.
Hourigan
J
, Ascano
M
. Microcrystal test and quality control procedures employed at the LAPD narcotics analysis unit
. In: Proceedings of the American Academy of Forensic Sciences; 2000 Feb 21–26; Reno (NV)
. Colorado Springs
: American Academy of Forensic Sciences
, Vol. VI
2000
; 53
, No. B71.5.
McCrone
WC
. Chemical problem solving without FTIR, EDX, NMR, XRD, etc or why I still use the polarized light microscope, PLM
. Microscope
0026-282X 2000
;48
(3
):155
–66
.6.
Wielbo
D
, Tebbett
IR
. The use of microcrystal tests in conjunction with Fourier transform infrared spectroscopy for the rapid identification of street drugs
. J Forensic Sci
0022-1198 1992
;37
(4
):1134
–48
.7.
Masoud
AN
. Systematic identification of drugs of abuse I: spot tests
. J Forensic Sci
0022-1198 1975
;64
:841
–4
.8.
Johns
SH
, Wist
AA
, Najam
AR
. Spot tests: a color chart reference for forensic chemists
. J Forensic Sci
0022-1198 1979
;24
:631
–49
.9.
Siegel
JA
. Forensic identification of controlled substances
. In: Saferstein
R
, editor. Forensic science handbook
. , Vol. II
.Englewood Cliffs
: Prentice Hall
, 1988
;68
–160
.10.
Clarke
EGC
, Williams
M
. Microchemical tests for the identification of alkaloids
. J Pharmacy and Pharmacology
0373-1022 1955
;7
:255
–62
.11.
Clarke
EGC
. Isolation and identification of drugs
. London
: The Pharma ceutical Press
, 1969
.12.
Fulton
CC
. Microcrystal tests
. In: Sunshine
I
, editor. Handbook of analytical toxicology
. Cleveland
: The Chemical Rubber Co
, 1969
;461– 96.13.
Standard Guide for Microcrystal Testing in the Forensic Analysis of Cocaine, E 1968-98
; Standard Guide for Microcrystal Testing in the Forensic Analysis of Methamphetamine and Amphetamine, E 1969-98
; Standard Guide for Microcrystal Testing in the Forensic Analysis of Phencyclidine and Its Analogues, E 2125-01
. Vol., 14.02, ASTM International
, West Conshohocken, PA
.14.
Clark
CC
. A study of procedures for the identification of heroin
. J Forensic Sci
0022-1198 1977
;22
:418
–28
.15.
Hider
CL
. The rapid identification of frequently abused drugs
. J Sciences Soc
0015-7368 1971
;11
:257
–62
.16.
Young
JL
. The detection of cocaine in the presence of novocaine by means of cobalt thiocyanate
. Am J Pharmacy
1931
;103
:709
–10
.17.
Chamot
EM
, Mason
CW
. Handbook of chemical microscopy II
. New York
: John Wiley
, 1931
.18.
De
Forest
PR
, Gaensslen
RE
, Lee
HC
. Forensic science, an introduction to criminalistics
. New York
: McGraw-Hill, Inc.
, 1983
.
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