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Vantaa, Finland

Pratt A.,Forensic Laboratory
Journal of Forensic Identification | Year: 2012

Data referencing the number of identifiable latent prints developed on firearms evidence over a three-year period was collected. The results showed a recovery rate of 13% on firearms and 7.6% on ammunition magazines. Factors that play a role in the recovery of identifiable latent prints are discussed. Source


Broseus J.,University of Lausanne | Huhtala S.,Forensic Laboratory | Esseiva P.,University of Lausanne
Forensic Science International | Year: 2015

For the first time in Finland, the chemical profiling of cocaine specimens was performed at the National Bureau of Investigation (NBI). The main goals were to determine the chemical composition of cocaine specimens sold in the Finnish market and to study the distribution networks of cocaine in order to provide intelligence related to its trafficking. An analytical methodology enabling through one single GC-MS injection the determination of the added cutting agents (adulterants and diluents), the cocaine purity and the chemical profile (based on the major and minor alkaloids) for each specimen was thus implemented and validated. The methodology was found to be efficient for the discrimination between specimens coming from the same source and specimens coming from different sources. The results highlighted the practical utility of the chemical profiling, especially for supporting the investigation through operational intelligence and improving the knowledge related to the cocaine trafficking through strategic intelligence. © 2015 Elsevier Ireland Ltd. Source


Jussila J.,Forensic Laboratory
Measurement: Journal of the International Measurement Confederation | Year: 2010

Functional reliability of a service firearm is essential. A failure to fire at a critical moment could lead to disastrous consequences. The firing pin of a weapon must hit the primer hard enough to ascertain reliable detonation of the primer which then ignites the powder. Depths of firing pin created indent on an inert primer and on a copper cylinder are the two methods conventionally used to estimate this percussion energy. In this study the copper cylinder method was compared with piezoelectric measurement. It was found out that both systems give reliable readings. Eight pistols of calibre 9 mm were measured. Although the majority of the measured weapons seemed to provide sufficient percussion energy, there were some surprisingly low readings with seemingly perfect weapons. This discrepancy shows the necessity of an industrial standard and of using a reliable percussion energy measurement system for monitoring the condition of service weapons. Further research on firearm and ammunition primer compatibility is required. © 2009 Elsevier Ltd. All rights reserved. Source


Abu Shawish H.M.,University of Palestine | Abed Almonem K.I.,Minesty of Education and Higher Education | Saadeh S.M.,Islamic University of Gaza | Al-Lham W.S.,Forensic Laboratory
Measurement: Journal of the International Measurement Confederation | Year: 2016

A modified carbon paste electrode for haloperidol drug based on haloperidol-phosphomolybdate (HP-PM) as an ion-exchanger dissolved in plasticizer DBP and its potentiometric characteristics were discussed. The electrode exhibited a good Nernstian slope of 56.9 ± 0.3 mV/decade with a linear concentration range from 3.2 × 10-6 to 1.0 × 10-2 M for the haloperidol ion. The limit of detection (LOD) was 1.5 × 10-6 M. It had response time of 5-8 seconds (s), useable in pH range of 6.2-8.6 and temperature of 20-60°C. The electrode shows clear discrimination of haloperidol drug from several inorganic ions, sugars and some common drug excipients. The sensor was applied for determination of haloperidol drug in urine and in pharmaceutical formulations using potentiometric determination, standard addition and the calibration curve methods. The results are satisfactory with excellent percentage recovery comparable or better than those obtained by other routine methods. © 2015 Elsevier Ltd. Source


Patterson R.,College of Charleston | Mabe P.,College of Charleston | Mitchell E.N.,Forensic Laboratory | Cory W.,College of Charleston
Forensic Science International | Year: 2012

For street samples suspected of containing the phosphodiesterase-5 inhibitors sildenafil (Viagra®) and/or vardenafil (Levitra®), including powders or adulterated herbal supplements, a chemical analysis is needed to provide confirmatory identification of these illegally procured substances. Sildenafil and vardenafil are structurally similar and it is difficult to differentiate between them, as previous mass spectrometric studies have shown the two drugs to produce similar fragmentation patterns. The use of tandem mass spectrometry can produce confirmatory data, but the technique requires a high level of technical expertise. We have developed an electrospray ionization-liquid chromatography-mass spectrometry (ESI-LC-MS) method that allows differentiation between these two structurally similar molecules via in-source fragmentation in combination with an ion trap mass spectrometer. A very stable gas phase ion is formed during in-source fragmentation of vardenafil; the combination of the stability of this ion and the longer residence time for the ion in the ion trap results in a very strong signal. This feature results in a method that can provide clear differentiation between sildenafil and vardenafil while at the same time requiring less expertise from the routine analyst to confirm the presence or absence of the two compounds. © 2012 Elsevier Ireland Ltd. Source

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