Social and Behavioral Sciences Commons^™

Exploring The Relationship Between Anger, Aggression, And Perpetrator Substance Use In The Commission Of Sexual Offenses, Dominique Rivera

Student Theses

This study examined the potential association between perpetrator substance use, anger, and aggressive behavior in the commission of sexual crimes. The sample included 246 adult males convicted of rape (n = 54) or child molestation (n = 192). Descriptive statistics revealed that 64.6% of the individuals in this sample (n = 159) were intoxicated at the time of the offense. Results showed that perpetrators who used substances at the time of the offense were more likely to exhibit aggressive behavior toward the victim (e.g., weapon use, verbal abuse) than those who did not. Offenders with higher pervasive anger scores were …

The Determination Of G1 And G7 Ballistic Coefficients Of .22lr Caliber Ammunition In Gypsum Board Through Doppler Radar Acquisition, Jose A. Colon Jr.

Student Theses

In this experiment, a method of calculating ballistic coefficients of .22LR (long rifle) caliber ammunition was developed using Doppler radar to track the pre-impact and post-impact velocities of projectiles passing through gypsum board. The method demonstrated has distinct advantages in accuracy and flexibility over conventional chronograph projectile tracking that forensic firearm experts should consider when determining the optimal method to obtain a ballistic coefficient (BC). G1 and G7 ballistic coefficients were determined for three .22LR ammunition brands with respective muzzle velocities of approximately 1050ft/s (320m/s), 1230ft/s (375m/s), and 1640ft/s (500m/s) fired from a Ruger 10/22 semi-automatic carbine using an Infinition …

Estimating Muzzle To Target Distance From The Physical Characteristics Of A Bullet Hole In Different Wood Substrates, Alan Lee

Student Theses

Determining the muzzle to target distance of a firearm discharge is an integral part in crime scene reconstruction. Shooter distance is most often estimated using the Modified Griess test, which can be used to visualize gunshot residue (GSR) patterns around bullet holes. However, this test has a 3- to 5-feet range limit as the plume of GSR particles can only travel a certain distance past the muzzle. The purpose in this study was to develop a new method that overcomes this range limitation by analyzing the physical damage characteristics of a bullet hole. Test fires were conducted with a .22 …

Effects Of Microwave Radiation On The Digestion Of Proteins Involved In Body Fluid Identification, Aaron J. Fox

Student Theses

Body fluid identification plays an important role in understanding how the events during a crime may have taken place. The presence of a body fluid may help identify an individual who committed a crime, while the type of body fluid present may help investigators determine how a crime occurred. Current body fluid identification techniques are not always conclusive and may only suggest the presence of a body fluid type. A protocol developed by the New York City Office of the Chief Medical Examiner (OCME) established a method that confirms body fluid type through mass spectrometry. To identify marker proteins in …

Performance Of A Dna And Protein Co-Extraction With Trypsin In Comparison To Two Proteinase K Based Dna Extraction Methods, Dinura A. Gunatilake

Student Theses

Effective DNA extraction methods are important for forensic applications. The main goal of this experiment was to determine if a newly developed trypsin based protein/DNA co-extraction method applied to contact traces would yield comparable results to a commercial Proteinase K method (QIAamp DNA Investigator Kit) and a Chelex extraction method with Tween 20 used in forensic laboratories. This was tested on 20 sets of sebaceous fingerprints on glass slides.

The results of this study demonstrate the trypsin co-extraction method yielded the highest amount of DNA. In the first comparison, the mean total DNA yields for the trypsin-co extraction method and …

The Relationship Between Impact Energy And Glass Fracture Via .177 Caliber Steel Bbs, Jocenel Beach

Student Theses

Fractured glass is often found at shooting scenes and can provide useful information for crime scene reconstruction. Mechanical glass fracture from a projectile impact can result in different types of fracture patterns. The degree of fracture depends on several factors including: type of glass, the thickness of the glass, curvature (if any), distance from the muzzle, contact angle, and type of projectile. Correlating impact energy to the degree of glass fracture can provide useful information regarding the muzzle-to-target distance for a particular firearm/ammunition combination. This research focuses on the projectile impact velocity of .177 steel BBs shot from a pneumatic …

Further Evaluation Of A Dry Vacuuming Technique For Recovery Of Dna From Handwritten Documents, Christian Hopkins

Student Theses

A previously developed, non-destructive, homemade vacuum method for collecting biological material from handwritten documents had promising DNA results for white copy paper, preserved indented writing, and latent prints. Prior to casework implementation, additional validation experiments are warranted and here the method was tested for different paper substrates. This work describes testing of notebook paper, bank deposit slips, magazine pages, and manila envelopes. The quantity of recovered DNA varied from donor to donor, but the mean quantities showed a trend that can be explained by the different sizes and surface properties of the tested paper types. The rougher paper type, like …

The Application Of A Simple Tissue-Disruption Method To Dna Extraction For Species Identification, Jordana R. Fox

Student Theses

The TissueLyser II was used to disrupt animal bones and plant tissue without dry ice or liquid nitrogen for species identification. Bone fragments of fresh swine (Sus scrofa) ribs were used. A 521bp fragment of the cyt b locus was analyzed, and the BLASTn results confirmed that the origin of all the samples was swine (E-value = 0.0). Bone fragments of bovine, chicken, duck, fish, sheep, and swine were also used to test the procedure. An approximately 600bp fragment of the COI locus was analyzed, and the BLASTn results confirmed the origin of all the samples (E-value = …

Developing A Maceration Method For Isolation Of Dna From Cancellous Bones, Bryan Bernal

Student Theses

Prior to isolating DNA, it is necessary to remove any biological materials that may be present on commingled remains. Manual maceration of the outer surface is time-consuming. This study will address this issue by developing a simple method for processing bone samples prior to DNA isolation. A liquid-based technique was applied to macerate bone fragments by incubating bone fragments in an enzyme solution, removing potential contaminants, followed by a bone tissue disruption. Swine (Sus scrofa) bones were used to simulate human bones. Microscopic analysis suggested this method was effective for surface material removal. The methods effect on the …

Archaeology Or Crime Scene? Teeth Micro And Macro Structure Analysis As Dating Variable, Jessica A. Vincenty

Student Theses

Simple methods to aid in the determination of forensic or archaeologic relevancy of skeletonized remains have been researched since the 1950s. With advances in microscopic imaging techniques and machine learning computer data analysis methods the relevancy of decontextualized, comingled remains has room for improvement. This thesis is a study done to pioneer a new approach to analyzing dental skeletal remains to determine forensic relevancy.

Archaeological dental samples collected from the ancient city of Ur in modern day southern Iraq in addition to modern dental extractions were processed for scanning electron microscopy imaging. Archaeological and modern samples displayed different surface and …

Juveniles Tried As Adults:The Impact Of Youth Demographic Factors On Juror Perceptions, Denieka Ellis

Student Theses

Abstract: This study explored the impact of defendant age, race and stereotypic crime on verdicts and recommended sentencing of juveniles tried as adults. Previous research shows that jurors enter trial with negative preconceptions and biases of juveniles because they are being tried within an adult venue. These negative preconceptions have led jurors to recommend harsher sentencing for juveniles rather than adults with the same defendant characteristics and criminal history. Crime type and crime severity have also been shown to impact perceptions of juvenile defendants in adult court. However, research has not yet explored the potential impact that stereotypic crime—a crime …

Felony Disenfranchisement: Factors Relating To Support For Restoration, Alexis K. Karpf

Student Theses

Felony Disenfranchisement, a collateral consequence, strips justice-involved individuals of their voting rights. While this policy is enacted in 48 states and the District of Columbia, a majority of community members are unaware of its existence. The current study used three hypotheses to guide its research about how education about disenfranchisement policy impacts a community member's opinion:1) Participants exposed to information about the effects of disenfranchisement will be more supportive of enfranchisement than those in the control condition; 2) Participants who receive the vignette featuring the White justice-involved individual will indicate a higher level of support for enfranchisement compared to those …

Semi-Quantitative Detection Of Signature Peptides In Body Fluids By Liquid Chromatography Tandem Mass Spectrometry (Lc-Ms/Ms), Tebah N. Browne

Student Theses

This study covers a modified semi-quantitative approach for liquid chromatography mass spectrometry (LC-MS/MS) signature peptide detection for body fluid identification. Peptide concentrations were measured based on synthetic peptide standards. Samples were processed with varying trypsin digestion and purification protocols, including a three-hour trypsin digestion and Microcon membrane filtration. The Microcon filtration method generates polymerase chain reaction (PCR) compatible DNA and peptide fractions that can be analyzed without any further purification. Preliminary validation tests covered stains on different substrates, semen/ saliva mixtures, minimum sample volume, and repeatability. All signature peptides in the multiplex were present at different concentrations and varied amongst …

Impact Of Think/No-Think Paradigm On Memory For Inadmissible Evidence, Catherine Hackett

Student Theses

Jurors are typically not able to disregard inadmissible evidence when asked to do so by judges. Yet, there is no research using the think/no-think paradigm on juror memory, which could be beneficial for trials in which inadmissible evidence is an issue. This study uses witness photos and statements to see if the material can be intentionally remembered and intentionally forgotten through a think/no-think task in which participants are cued to think about some witness photo/statement combinations and not think about other photo/statement combinations. Participants were responsible for learning pairs of faces and statements of witnesses from an alleged stabbing. After …

Examining The Impact Of Competency To Stand Trial And Judicial Instructions On Ngri Verdicts, Erin K. O'Donnell

Student Theses

Objective: The current study tests whether jury-eligible adults follow judicial instructions to disregard information about a defendant’s pretrial competency status when deciding whether he is guilty or not guilty by reason of insanity. Hypotheses: It was anticipated, because of the effects of hindsight bias, that defendants who were previously found competent to stand trial would be less likely to be found NGRI than a defendant who previously was deemed incompetent but has been restored to competency for trial. We also predicted that judicial instructions to disregard pretrial competency status would not effectively eliminate the effect of competency status without an …

The Criminalized Victim: Can Knowledge Of Trauma And Coercion Influence Free Will Doubt And Perception Of Culpability For Sex Trafficked Individuals?, Megan Korovich

Student Theses

Individuals who have been sex trafficked are continuously being targeted for prostitution and other related offenses instead of being recognized for their victimization. This may occur due to a fundamental lack of understanding of the sex-trafficked experience, allowing for misperceptions to form unhindered. Individuals with these misperceptions then go on to form laws and services intended to aid victims, but instead leave them vulnerable and criminalized. This study assessed whether an educational intervention on the experience of a sex-trafficked individual could influence public perceptions of free will doubt and criminal culpability. This study used a nonequivalent groups posttest-only design to …

Remembering School Shootings: An Examination Of Intergenerational Differences, Kelly Huie

Student Theses

In recent years, school shootings have evolved from rare occurrences to a full-blown epidemic, causing generations of students to have a realistic fear of attending school. When negative or traumatic events like a school shooting occur, people often form long lasting recollections of where they were, when learning about the traumatic, public event. Hence, the aim of this study was to understand if certain school shootings are more memorable for Americans, and whether differences exist across generations, as certain school shootings that occur during the reminiscence bump period (i.e., between the ages 10 – 30) may influence which shooting is …

The Romanticization Of Violent Male Offenders: How Trauma And Internalized Sexism Can Explain Women's Fascination With Serial Killers, Ella R. Johnson

Student Theses

Past research has noted that women are interested in true crime more than men (Vicary & Fraley, 2014), and that some women romanticize violent male offenders (Isenberg, 1991). This study investigated women’s fascination with serial killers compared to other offenders and the psychological correlates of women who are fascinated with serial killers. I hypothesized women’s fascination was unique to serial killers and may be related to safe and culturally acceptable ways of coping with interpersonal trauma. Results largely support these hypotheses, indicating women were more fascinated with serial killers compared to other offenders, and with PTSD, child abuse, intimacy attitudes, …

Not All Videos Are Created Equal: Camera Perspective Bias And Video-Recorded Eyewitness Identification Procedures, Kelsey N. Doherty

Student Theses

Video-recorded eyewitness identification procedures can preserve an accurate record of the conditions under which the eyewitness made an identification. Scholars posit that having the record will allow legal actors to make better decisions on the basis of an identification. Yet limited research has examined how jurors’ judgments are influenced by this evidence. Research on other types of video-recorded evidence has demonstrated a strong camera perspective bias, wherein jurors’ judgments are influenced by the angle with which the evidence is recorded. This study examined whether the camera perspective bias similarly influences jurors’ perceptions of video-recorded identification procedures. Participants viewed a mock …

Substance Use, Neurocognitive Deficits, And Criminal Recidivism, Emily H. Kim

Student Theses

Many offenders demonstrate substance use and neurocognitive impairments. Substance use directly impacts executive functioning due to poor impulse control, leading to impaired decision- making. Substance use and neurocognitive deficits also contribute to recidivism. Incarcerated individuals with substance use disorder have higher rates of recidivism, and executive dysfunction has been shown to contribute to recidivism due to low behavioral inhibition skills and deficiency with cognitive flexibility. There is a discontinuity in literature, however, since many studies only investigate either substance use or neurocognitive deficits to predict recidivism. However, it is important to examine the interaction of these factors to predict future …

The Relationship Between Traumatic Brain Injuries, Impulsivity, And Crime, Brian Ramanauskas

Student Theses

The rate of traumatic brain injuries (TBIs) are increasing each year, impacting an estimated 1.4 million Americans. After further investigation, researchers have concluded that 8.5% of the general public sustains at least one TBI, whereas this number ranges from 25% to 87% in criminal populations. In the literature, impulsivity is frequently described as poorly conceived, prematurely expressed, or inappropriate behaviors. Additionally, poor impulse control has been shown to significantly impact the likelihood of criminal activity, increasing the rate of recidivism. The current study examined an archival dataset of 95 incarcerated individuals from a private correctional facility in a large mid-Atlantic …

The Language Abilities Of Justice-Involved Adults, Talaya Patton

Student Theses

This study explores the relationship between language abilities and involvement with the justice system across the lifespan. Previous research has demonstrated a significantly higher prevalence of language impairment in juvenile justice populations, relative to the general population. These language impairments have been found across both expressive and receptive abilities, often previously undiagnosed.Further, juvenile justice involvement is a well-established predictor for later adult criminal behavior.However, no studies to date have explored the effects of language abilities and juvenile justice involvement on future outcomes, namely continued justice involvement in adulthood. The current study utilizes archival data on 95 incarcerated men to analyze …

Discrimination Of Monozygotic Twins Using Dna Methylation Levels Of One Cpg Site At Chromosome 3, Dino O. Robinson

Student Theses

Conventional STR typing, commonly used in forensics for human identification, poses a problem in criminal cases and paternity disputes involving monozygotic (MZ) twins because they share identical DNA sequences. To date, no routine method is available in forensics to differentiate between individuals of MZ pairs. Recently, epigenetic methods measuring differential DNA methylation patterns have been applied to MZ twin differentiation. In this study, we investigated the potential to identify MZ twins using a previously identified DNA methylation site in chromosome 3, cg18562578, in a sample of 129 MZ and 37 dizygotic (DZ) twin pairs. We used bisulfite converted saliva DNA …

Analysis Of Cannabinoids In Serum By Gc-Ms/Ms, Christie Cannarozzi

Student Theses

Due to recent changes in federal and state legislations, the availability and consumption of cannabis products have increased in the United States. The expanded use of recreational and medicinal cannabis products increases the importance of implementing sensitive and selective instrumental methods in toxicological laboratories, as legal implications may arise in forensic cases, such as driving under the influence of drugs (DUID). The purpose of this study was to perform a cross-validation for the quantitative analysis of cannabinoids (Δ9-tetrahydrocannabinol, cannabidiol, cannabinol, 11-hydroxy-Δ9-tetrahydrocannabinol, and 11-nor-9-carboxy-Δ9-tetrahydrocannabinol) in serum by gas chromatography coupled to triple quadrupole tandem mass spectrometry (GCTQ). This method was fully …

Discrimination Of Soil Organic Matter Using Nuclear Magnetic Resonance In Conjunction With Principal Component Analysis, Victoria G. Hsieh

Student Theses

The characterization of trace evidence is key to the field of forensic science. Trace evidence can take many forms, such as glass, fiber, and soil. Traditionally, forensic soil analysis has been painted as one of the more tedious applications, which conventionally studies the mineral composition of soil samples. In this study, we present another avenue of soil analysis that takes advantage of understudied factor of soil: soil organic matter (SOM). Using both proton (¹H NMR) and carbon nuclear magnetic resonance (¹³C NMR) separately and applying principal component analysis (PCA) to both types of spectra, we sought …