Forensics, Narcotics

As part of "The Future of Forensic Analysis," executive editor Jerome Workman, Jr. sat down with Igor Lednev to discuss several of his recent papers related to his spectroscopic research in forensic analysis.

A recent study explores the effectiveness of near-infrared (NIR) and ultraviolet-visible (UV-vis) spectroscopy in determining the time since deposition (TSD) of bloodstains, a critical aspect of forensic investigations. By comparing these two methods, researchers aim to improve the accuracy and reliability of bloodstain dating, with potential implications for real-world forensic applications.

Along with the one-day online event, Spectroscopy will also release an e-book containing additional, never-before-seen coverage.

The Future of Forensic Analysis will be released later in 2024.

Forensic scientists have made significant strides in bloodstain identification, leveraging advanced hyperspectral imaging and machine learning to distinguish between human and animal bloodstains with remarkable accuracy.

Scientists from Florida International University and Escola Universitària Salesiana de Sarrià Passeig are working on a novel approach to differentiate the structure of fentanyl analogues.

Brazilian scientists recently discussed and showed findings that show near-infrared (NIR) spectroscopy as a potentially effective technique for detecting ecstasy.

Pete Diaczuk of John Jay College of Criminal Justice gave a recollection at EAS 2023 of a case he worked on in Manhattan involving a victim fatally shot, incomplete ballistic evidence, and the wrong gun recovered at the scene.

Scientists at West Virginia University have created a new LIBS system meant to better identify the components of gunshot residue at crime scenes and in evidence.

Spray paint is often used by vandals for creating graffiti, as well as for criminals to leave signs, messages, and blots to conceal the left traces at the scene of their efforts. Rajinder Singh and his colleagues in the Department of Forensic Science at Punjabi University (Punjab, India) have used attenuated total reflectance Fourier transform infrared (ATR-FT-IR) spectroscopy for nondestructive analysis of 20 red spray paints of different manufacturers, which could possibly be encountered at a crime scene, particularly in case of vandalism. Singh spoke to Spectroscopy about the findings, and the paper that resulted from their efforts.

An ongoing challenge within the forensic science community is the development of consistent report and testimony language that conveys results in a meaningful manner.

The isotopic profile of a material refers to the ratios of the stable isotopes of elements contained within, such as 2H/1H, 13C/12C, and 18O/16O. Biological, chemical, and physical processes cause variations in the ratios of stable isotopes; analysis of a material for its distinctive isotopic signature can thus be used to reveal information about its history. Isotope ratio mass spectrometry (IRMS) is a technique used to measure the relative abundance of isotopes in materials. Forensic investigators have used IRMS to measure a variety of materials, such as drugs, explosives, food, and human remains. In a recent web seminar, Lesley Chesson, the president of IsoForensics, Inc., explained how IRMS works and discussed the use of IRMS in forensic science, illustrating her discussion with several case examples.

Recent advances in Raman instrumentation have resulted in the development of easy-to-use and efficient handheld Raman analyzers. Most of the commercially available handheld Raman devices utilize 785 or 1064 nm excitation. This paper directly demonstrates the performance of 532 nm handheld Raman (versus 785 and 1064 nm) for the analysis of biopharmaceuticals for structure and counterfeit testing as well as explosive detection (TSA screening and CSI applications). The results presented here will contribute to recognition of 532 nm Raman excitation as a highly attractive option for a rapid “in-place” analysis in the field.

The isotopic profile of a material refers to the ratios of the stable isotopes of elements contained within, such as 2H/1H, 13C/12C, and 18O/16O. Biological, chemical, and physical processes cause variations in the ratios of stable isotopes; analysis of a material for its distinctive isotopic signature can thus be used to reveal information about its history. Isotope ratio mass spectrometry (IRMS) is a technique used to measure the relative abundance of isotopes in materials. Forensic investigators have used IRMS to measure a variety of materials, such as drugs, explosives, food, and human remains. In a recent web seminar, Lesley Chesson, the president of IsoForensics, Inc., explained how IRMS works and discussed the use of IRMS in forensic science, illustrating her discussion with several case examples.

The analysis of hair samples is gaining increasing interest in forensic science because of several advantages. Hair samples are easy to collect and store. The keratin protein in hair is also quite stable, and the amino acid composition of human hair keratin may vary significantly between individuals. Glen Jackson of West Virginia University has been developing various mass spectrometry (MS)-based methods for forensic analysis of hair samples, and he recently spoke to us about this work.

A huge amount of information is contained in the FTIR spectra of soils in the mid infrared (MIR) region (4000 to 400 cm-1). The spectra provide an overall chemical profile of the soil, encompassing fundamental vibrations of both the organic and mineral components. Interpretation of the spectrum of individual soils can provide a powerful means of differentiating between samples and therefore has considerable potential for use in forensic applications, and indeed we have successfully used laboratory-based FTIR analysis of soil to provide evidence in forensic casework. In recent years handheld FTIR spectrometers have become available and this makes it possible for in situ or field-based FTIR analysis of soils at a crime scene. However, reliable and tested protocols are not yet available for field-based FTIR analysis of soil. This paper discusses the sampling options for field-based FTIR of soil and describes tests of the methodology we are developing, for a handheld FTIR, on soil samples tested in the context of a mock crime scene.

Enzyme immunoassay (EIA) is a conventional drug screening technique, but it can be limited by cross-reactivity that can lead to high false positive rates.

The Raman technique is gaining widespread acceptance as an investigative tool for forensic applications.

In this study, regression and classification chemometrical algorithms were combined to achieve effective discrimination of pure body fluids from their binary mixtures.

An investigation of the different kinds of clay used as paint additives with the goal of discriminating the paints

Confocal Raman microscopy can identify particles in the 5–50 ?m range and can bridge the gap between micro-FT-IR and SEM-EDS analyses.

In response to the growing concern in the United States over the threat of nuclear terrorism, the Domestic Nuclear Detection Office (DNDO) in the Department of Homeland Security (DHS) launched the National Nuclear Forensic Expertise Development Program (NNFEDP) in 2008. Led by DNDO in close collaboration with the Departments of Energy (DOE) and Defense, the NNFEDP is an interagency effort committed to developing and maintaining a robust academic and technical pipeline to strengthen the nuclear forensics workforce.

The Domestic Nuclear Detection Office in the Department of Homeland Security launched the National Nuclear Forensic Expertise Development Program (NNFEDP) in 2008. The NNFEDP is an interagency effort committed to developing and maintaining a robust academic and technical pipeline to strengthen the nuclear forensics workforce.

Spectroscopy recently spoke to Sam Houk, professor of chemistry at Iowa State University, and scientist in the Ames Laboratory of the United States Department of Energy, about the current state of ICP-MS, including its use in forensics.