Ahmad Fahmi Lim Bin Abdullah

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Evaluation of the risk posed by contaminants present during and after decontamination of clandestine methamphetamine laboratories requires a connection between the levels of contaminants measured and those actually present at the scene. The recoveries of pseudoephedrine and methamphetamine from glass, stainless steel, and a range of impermeable surfaces(More)
Smokeless powders are low explosives and are potentially found in cases involving firearms and improvised explosive devices. Apart from inorganic compound analysis, forensic determination of organic components of these materials appears as a promising alternative, especially the chromatographic techniques. This work describes the optimization of a(More)
Gunshot residues, produced after shooting activity, have acquired their importance in analysis due to the notoriety of firearms-related crimes. In this study, solid-phase microextraction was performed to extract the headspace composition of spent cartridges using 85-μm polyacrylate fiber at 66°C for 21 min. Organic compounds, that is, naphthalene,(More)
Malaysia has been identified as one of the clandestine drug laboratory operation hotspots in this region as indicated by the increasing number of clandestine laboratories being dismantled. Methamphetamine is one of the major illicit drugs manufactured in these laboratories. This study aims to characterise methamphetamine manufactured in Malaysia via(More)
New psychoactive substances, including synthetic cathinone, had gained popularity within the industry of narcotics. The presence of these synthetic substances as new products in the market requires better information sharing among law enforcement agencies worldwide. Up-to-date information about such substances testing in forensic laboratory is needed. In(More)
Sixty-four groups of Erimin-5 tablets from 23 sources were profiled based on their dye and active ingredients. Dye of the tablets was extracted using 5% acetic acid and subjected to TLC separation using isopropanol/ammonia (4:1) as the solvent system while the active ingredients were analysed using GCMS and diluents were analysed using FTIR. All tablets(More)
Nondestructive techniques for gathering evidence are important in the field of forensics. Due to the geometry of the substrates, nondestructive visualization of fingermarks on curved surfaces remains challenging. A novel contactless technique was developed for visualizing and recording fingermark patterns on nonporous curved surfaces of circular cross(More)
Sample preparation is important to prepare a sample for optimum performance characteristics during analytical procedure. A review of papers on the practical applications of solid phase microextraction (SPME) is presented particularly in the analysis of gunshot residue (GSR). The general introduction on SPME and its theory are included. This review(More)
New psychoactive substances, also labeled as designer drugs had gained popularity in the recent years within the industry of narcotics as “legal” alternatives to the internationally controlled drugs. We review on the prevalence of synthetic cathinone and its derivatives from various sources. Syntheses of synthetic cathinone and its derivatives particularly(More)
Background correction algorithm (BCA) is useful in enhancing the visibility of images captured in crime scenes especially those of untreated bloodstains. Successful implementation of BCA requires all the images to have similar brightness which often proves a problem when using automatic exposure setting in a camera. This paper presents an improved(More)