Forensic Science and Technology Commons^™

Determination Of The Trace Elemental Signature Of Drywall Dust And Its Implication As Forensic Evidence, Emilee Holmes

Master of Science in Forensic Science Directed Research Projects

Drywall is found in most homes built in the United States of America because it is cost effective, light weight, and easy to install. Its brittle nature makes it less resistant to impact which can cause dust to form if a force is exerted on it. Airborne dust can settle on anything or anyone around it and can be considered trace evidence for its ability to connect suspects, victims, and scenes; however, this type of dust is not emphasized as trace evidence and is not always collected due to a lack of understanding of their forensic signatures.The seven producers of …

Utilizing Gc-Ms To Determine The Effect Of Solvent Extraction Parameters On Forensic Smokeless Powder Analysis, Leighann R. Weber

Master of Science in Forensic Science Directed Research Projects

Since its invention in 1884, smokeless powder has been of scientific interest. During World War II, research initially focused on developing methods to evaluate powders' stability. However, today, the focus has shifted to developing instrumental techniques sufficient for forensic classification and comparison work. Smokeless powder is typically encountered in forensic science casework involving firearms and explosives. In forensic investigations, determining the exact formulation of smokeless powders is challenging due to their complex chemistry and the proprietary nature of production. LC-MS and GC-MS techniques have been used to analyze intact and post-blast smokeless powders. Despite the vast amount of research that …

Evaluation Of Tooth Sample Preparation For Traditional Forensic Dna Vs Rapidhit Id Processing, Morgan E. Eaton

Master of Science in Forensic Science Directed Research Projects

Disaster Victim Identification (DVI) refers to the process of forensic identification of unknown individuals following a mass disaster or fatality incident.¹ In events of mass disaster, human dental structures are often the only viable DNA source remaining, as soft tissues are more easily degraded, contaminated, or otherwise compromised. Due to the protective nature of dental enamel and dentin surrounding the inner pulpal tissue, a labor-intensive sample preparation performed by extensively trained personnel is necessary to expose the nuclear material preceding the traditional forensic DNA workflow.^2,3 In high volume cases, such as those often submitted for DVI, the current …

Morphological And Autofluorescence Signatures For The Identification Of Vaginal Cells In Mixture Samples Containing Saliva And/Or Epidermal Cells, Hannah L. Burden

Master of Science in Forensic Science Directed Research Projects

In forensic casework the identification of body fluids at a crime scene can frequently play an important role in reconstructing the events that occurred. There are several bodily fluid identification methods to characterize unknown stains recovered as evidence. However, there has not been a reliable method for detecting the presence vaginal cells and/or differentiate it from other forensically relevant tissue types that may be recovered from a crime scene. The detection of vaginal fluid is important for forensic casework due to the abundance of sexual assault kits that are not only backlogged but continue to be submitted to the lab …

Teaching Forensic Entomology With Common Grocery Items: Decomposition And Insect Succession Studies, Erin Bauer, Charles Murrieta, Larry Barksdale

Department of Entomology: Faculty Publications

Forensic science and entomology programs may benefit from using deceased pigs as teaching resources due to anatomical similarities to humans. The use of such animals provides opportunities for students to learn the effects of geographical location and climate on insects; understand insect succession; practice insect collection and identification; and learn post-mortem interval procedures, taphonomic principles of decomposition, and crime scene investigation and management techniques. Forensic entomology and taphonomic studies fit well with educational interests in experiential learning. Pigs may be readily available through animal science departments or local producers, and many institutions may have property where this research can be …

Dna Transfer And Persistence On Non-Porous Surfaces Submerged In Spring Water [Preliminary Study], Morgan L.. Korzik, Josep De Alcaraz-Fossoul, Michael S. Adamowicz, David San Pietro

Forensic Science: Faculty Publications

Submerged items are often thought to lack evidentiary value. However, previous studies have shown the ability to recover DNA from submerged porous items for upwards of six weeks. The crevices or interweaving fibers in porous items are thought to protect DNA from being washed away. It is hypothesized that, because non-porous surfaces do not have the same traits that might aid in DNA retention, then DNA quantities and the number of donor alleles recovered would decrease over longer submersion periods. Additionally, it is hypothesized that DNA quantity and the number of alleles would be negatively affected by flow conditions. Neat …

Evaluating The Degradation Relationship Between Latent Print Impressions And Touch Dna Under Varying Environmental Conditions, Katrina M. Rupert B.S.

Graduate Theses, Dissertations, and Problem Reports (ETD)

Latent prints have been processed as a source of touch DNA evidence in the hopes of attaining partial or even full DNA profiles. However, the relationship between the latent quality and the DNA quality has not yet been fully explored, resulting in gaps in understanding how the two are connected. A common source of touch DNA is from latent print evidence, which is typically processed and photographed at a scene, and subsequently processed for DNA in the laboratory. However, there is skepticism in the forensic community around touch DNA as laboratory procedures are often manipulated beyond standard operating procedures to …

Strengthening The Interpretation Of Glass And Paint Evidence Through The Study Of Random Frequency Of Occurrence And Analytical Information, Lauryn C. Alexander

Graduate Theses, Dissertations, and Problem Reports (ETD)

Glass and paint particles are frequently discovered at crime scenes as valuable trace evidence. Often, these fragments are transferred from a crime scene to a victim or person-of-interest, and can subsequently be evaluated, analyzed, and classified according to their physical and optical measurements, and chemical properties, each of which can provide important information to the analyst to assist in the determining if a recovered particle is distinguishable or indistinguishable from a known source. Moreover, these minute materials can provide information about how the events took place, leading to the reconstruction of crime scenes and the identification of valuable clues for …

Feature Extraction Of Footwear Impression Images For Quality Assessment, Alexandra Hill

Graduate Theses, Dissertations, and Problem Reports (ETD)

Forensic footwear impression analysis is a valuable tool in criminal investigations. Extracting useful features from images of footwear impressions is a critical step in this process. However, the quality of these images can vary widely, making feature extraction challenging. In order to give a quality assessment rating to a footwear impression image, the image should first be analyzed to extract features from the impression. In this paper, we present a method to extract features from a 2D grayscale footwear impression image. A Hierarchical Grid Model implementation has been adapted from use on a 3D dataset to assist in finding features, …

Development Of A Mass Transfer Correction Factor In A Thermodynamic Model To Explain The Weathering Patterns Of Ignitable Liquids On Household Substrates At Elevated Temperatures, Max T. Denn

Graduate Theses, Dissertations, and Problem Reports (ETD)

To determine whether a questioned fire is the result of arson or not, forensic chemists will often attempt to extract and identify any ignitable liquid residues present in the fire debris. Forensic chemists use gas chromatography-mass spectrometry (GC-MS) to identify ignitable liquids based on similarities between chromatograms of fire debris extracts and those of reference ignitable liquids that have been evaporated (weathered) to different extents. Casework samples often appear to be relatively unweathered (e.g., 40-60%) and conventional wisdom is that the apparent lack of weathering is the result of entrapment; a process by which liquid residues are absorbed into the …

Evaluation Of Emerging Screening Technologies For The On-Site Detection And Identification Of Methamphetamine And Its Precursors In Simulated Clandestine Lab Operations, Alexis Nicole Wilcox

Graduate Theses, Dissertations, and Problem Reports (ETD)

Stimulant drugs comprise one of the top drug categories abused in the United States. Due to its accessibility, low price, and manufacturing simplicity, methamphetamine is frequently placed within the top 10 seized drugs in the country. As of March 2023, methamphetamine is the most seized controlled substance in the United States, with 34,291 kg. In 2022, the United States seized over 79,000 kg of methamphetamine. One reason for the proliferation of methamphetamine is related to the production itself, which does not require large warehouses but can be manufactured in houses using relatively accessible materials and small containers. When a clandestine …

Assessment Of Acquisition, Retention, And Evolution Of Randomly Acquired Characteristics With Wear, Nathaniel Weston

Graduate Theses, Dissertations, and Problem Reports (ETD)

The recovery of known-source shoes for the purpose of comparison to crime scene impressions often occurs with a temporal lag. During this passage of time, the outsole can be altered due to continued wear. These changes may impact forensically relevant characteristics of use known as randomly acquired characteristics (RACs). Continued wear may cause the formation of new RACs, cause RACs to undergo some degree of geometric change, and/or lead to the loss of formerly existing RACs. Consequently, the correspondence between a test impression from a known mated shoe with continued wear and a questioned impression with less wear deposited at …

Analysis Of Fiber Uv Degradation Through An Environmental Chamber, Davis A. Eames

Undergraduate Research Posters

Environmentally degraded fibers could impact multiple aspects of a fiber comparison, considering that collected weathered fabrics/fibers may express an altered chemical structure and/or colorimetric property compared to their unexposed counterparts. Depending on the amount of degradation the evidence has suffered, it could be challenging for forensic scientists to make conclusions from their comparative analyses. Observations presented in this study were orchestrated to test the possible outcomes that sunlight has on fabric-based materials. Photodegradation of fabrics was investigated through the use of an environmental chamber for a duration of six weeks, which would be equivalent to three months of real-world UV …

An Assessment Of The Forensic Aspects Of Genetic Genealogy, Sarah Hester

Graduate Theses, Dissertations, and Problem Reports (ETD)

Forensic genetic genealogy has grown in both popularity and controversy in recent years. The genetic information comes from large numbers of single nucleotide polymorphism (SNP) markers. Polymorphism variations can be traced through familial lineage, determining how closely individuals are related to each other based on the similarities and differences in SNPs within their DNA. Polymorphisms account for approximately 85% of human variation. Genealogy and ancestry determination companies trace the lineage of a person back through multiple generations using polymorphisms. As more individuals submit their DNA for analysis the genealogical profile databases continue to grow in size. Law enforcement uses genealogical …

Cheiloscopy Patterns In Individuals With And Without Parafunctional Oral Habits: A Cross-Sectional Observation Pilot Study, Emily Regan, Brenda Bradshaw, Ann Bruhn, Walter Melvin, Sinjini Sikdar

Dental Hygiene Faculty Publications

Purpose

Lip prints are unique and have potential for use as a human identifier. The purpose of this study was to observe possible cheiloscopy differences of individuals with and without parafunctional oral habits such as smoking, vaping, playing a wind instrument or using an asthma inhaler.

Methods

This IRB approved blinded cross-sectional observation pilot study collected lip prints from 66 individuals, three of which were excluded. Participants cleansed their lips, then lipstick was applied to the vermillion zones of the upper and lower lips. Adhesive tape was applied to the lips and prints were transferred to white bond paper for …

Judging Firearms Evidence And The Rule 702 Amendments, Brandon Garrett, Nicholas Scurich, Eric Tucker, Hannah Bloom

Faculty Scholarship

No abstract provided.

Security Investigations: A Professional's Guide, Alan Saquella, Larry Nicholson

Publications

From the forward:

"Security Investigations A Professional’s Guide has been expertly crafted to equip both novices and experienced investigators with the essential knowledge and skill to excel in the field of investigations. Whether aiming for a career in law enforcement, private investigations, corporate security, or you are simply interested in unraveling mysteries, this book will serve as your ultimate companion on the journey to becoming a proficient investigator."

Chapters 1 and 2 are presented here.