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Evaluation of links in heroin seizures
L Dujourdy1, G Barbati, F Taroni
1Institut de Police Scientifique et de Criminologie, University of Lausanne, BCH, 1015 Lausanne-Dorigny, Switzerland. laurence.dujourdy@ipsc.unil.ch
Forensic Science International
|February 19, 2003
Abstract:
The evaluation of a link between two heroin seizures using a descriptive method is presented. It is based on the measure of the angles between two chromatograms assimilated to vectors, and interpreted using a continuous approach based on the likelihood ratio of Bayes' theorem. A complete evaluation model thus avoids the drawbacks of decision thresholds used until now to establish a link. Validation is obtained through tests and simulation methods.