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Correlation of Cocaine Hydrochloride Samples Seized in Brazil Based on Determination of Residual Solvents: An Innovative Chemometric Method for Determination of Linkage Thresholds
journal contribution
posted on 2013-02-19, 00:00 authored by Jorge
J. Zacca, Tatiane S. Grobério, Adriano O. Maldaner, Maurício L. Vieira, Jez W. B. BragaCocaine sample correlation provides important information
in the
identification of traffic networks. However, available methods for
estimating if samples are linked or not require the use of previous
police investigation and forensic expert knowledge regarding the number
of classes and provide thresholds that are both static and data set
specific. In this paper, a novel unsupervised linkage threshold method
(ULT) based on chemometric analysis is described and applied to the
analysis of headspace gas chromatography mass spectrometry (HS-GC/MS)
data of more than 250 real cocaine hydrochloride samples seized by
Brazilian Federal Police. The method is capable of establishing linkage
thresholds that do not require any prior information about the number
of classes or distribution of the samples and can be dynamically updated
as the data set changes. It is envisaged that the ULT method may also
be applied to other forensic expertise areas where limited population
knowledge is available and data sets are continually modified with
the inflow of new information.
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traffic networkslinkage thresholdsdata setspolice investigationInnovative Chemometric Methodinformationchemometric analysisULT methodCocaine Hydrochloride Samples Seizedexpertise areasDeterminationLinkage ThresholdsCocaine sample correlationnovel unsupervised linkage threshold methodResidual Solventspopulation knowledgeBrazilian Federal Policecocaine hydrochloride samplesheadspace gas chromatography mass spectrometryexpert knowledge
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