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Forensic practitioners and crime laboratories regularly collect and analyze fingernail evidence; however, the best techniques for processing such evidence have not been established. In this study, numerous aspects of fingernail evidence processing—collection of exogenous cells, transportation, purification of DNA, and STR analysis—were analyzed using fingernails harboring applied blood or epithelial cells from scratchings. Autosomal STR mixtures resulted when fingernails were soaked or swabbed, while scrapings rarely generated mixtures but exhibited allelic dropout. Y‐STRs yielded single source profiles, with scrapings again showing dropout. A silica‐based kit extraction recovered significantly more exogenous DNA than did organic extraction, neither of which was affected by nail polish. Swabbing nails in succession resulted in some cross‐contamination from exogenous material, while transporting nails together did not, although there was loss of exogenous cells. Optimized nail processing produced complete Y‐STR profiles of male volunteers from female fingernails following scratchings. 相似文献
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Bradley Ray Ph.D. Dona Sapp M.P.L. Ashley Kincaid B.S. 《Journal of forensic sciences》2014,59(5):1248-1253
Research on traumatic brain injury among inmates has focused on comparing the rate of traumatic brain injury among offenders to the general population, but also how best to screen for traumatic brain injury among this population. This study administered the short version of the Ohio State University Traumatic Brain Injury Identification Method to all male inmates admitted into Indiana state prisons were screened for a month (N = 831). Results indicate that 35.7% of the inmates reported experiencing a traumatic brain injury during their lifetime and that these inmates were more likely to have a psychiatric disorder and a prior period of incarceration than those without. Logistic regression analysis finds that a traumatic brain injury predicts the likelihood of prior incarceration net of age, race, education, and psychiatric disorder. This study suggests that brief instruments can be successfully implemented into prison screenings to help divert inmates into needed treatment. 相似文献
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Since the mid‐1990s, osteometrics have been a major aspect in forensic anthropology. However, recent evidence has shown that practitioners have been using differing points to establish certain measurements; namely those involving the clavicle, scapula, ulna, femur, and tibia. Engaging 61 practitioners, this study examined and confirmed how extensive this discord is. The highest consistency rate among practitioners was the scapular breadth (62.3%), followed by the femoral anteroposterior subtrochanteric diameter (55%). All other levels fell below these, particularly the physiological length of the ulna which was the most inconsistently measured bone. Furthermore, these low consistency rates yielded percent mean differences between two and 20% of the measurement length, with ranges averaging 14 mm. In light of these results, it is recommended that the field take steps to improve the standardization of such problematic measurements, including reexamining all measurements currently listed in osteometric texts, reassessing the utility of each, and reissuing a comprehensive guide. 相似文献
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A standard method for positive identification is the use of antemortem and postmortem radiographic comparisons. The purpose of this research is to test the visual accuracy of antemortem and postmortem radiographic comparisons of cranial vault outlines and to evaluate their uniqueness using geometric morphometric methods. A sample of 106 individuals with varying levels of education and forensic case experience participated in a visual accuracy test. Of the 106 individuals, only 42% correctly assigned all of the radiographs, with accuracy rates ranging from 70 to 93% for each radiographic comparison. Vault shape was further examined using elliptic Fourier analysis, and paired t‐tests were computed on the first 10 principal components accounting for 100% of the variance, which found no significant differences. The visual accuracy test and elliptic Fourier analysis shows that vault outlines may not be unique enough for positive identifications when used as a sole indicator. 相似文献
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Purpose
Using the rational choice perspective, the current study investigates the impact that the environment and offending behavior have on serial sexual crime event outcomes.Methods
The effects of time and place factors, as well as offender modus operandi strategies, on sexual crime event outcomes are tested using Generalized Estimating Equations on a sample of 361 crime events committed by 72 serial sex offenders.Results
Time and place do impact serial stranger sexual offenders’ modus operandi strategies, but the place characteristics of the crime have more of an effect on the offender’s behavior than do the temporal conditions during which the event occurs. Subsequent analyses indicate that temporal and place factors, as well as offender modus operandi strategies, predict whether the offender completes the rape, his reaction to victim resistance, and the level of physical force that he inflicts on the victim, but not whether the victim is forced to commit sexual acts on the offender.Conclusions
Serial stranger sexual offenders are effective decision-makers who adapt their strategies to the physical environment in which they commit their crimes, but their degree of rationality can vary as some outcomes are more dependent on the context than the offender and his actions. 相似文献18.
Louis B. Schlesinger Ashley Gardenier John Jarvis Jamie Sheehan-Cook 《Journal of Police and Criminal Psychology》2014,29(1):44-51
A nonrandom national U.S. sample of 946 homicide crime scenes--supplied by the FBI Behavioral Science Unit for purposes of research--was studied to delineate the prevalence, types, levels, and motives for staging in domestic, nonserial sexual, serial sexual, and general felony homicides. Stagers were found to be a relatively small group who employ a variety of methods to alter the crime scene in an attempt to redirect the investigation away from themselves as logical suspects. Results also suggest that different types of homicides have different staging rates based primarily on the relationship (or connection) between offender and victim. Implications for investigations and understanding this type of crime scene behavior are discussed. 相似文献
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This research demonstrates the value of laser scanning confocal microscopy (LSCM) as a research tool in osteological studies, and diagenetic studies in particular. LSCM combines properties of light and scanning electron microscopy using laser light to excite fluorophores throughout the z-axis, developing a 3-D image. Using differential staining and selecting for specific wavelengths of light, one can image targeted materials. This research is divided into two parts: visualizing bone structures such as proteins and their decompositional products and visualizing diagenesis. Part one of this study utilized pig bones as a means of testing the overall ability of LSCM to fluoresce bone. Twenty-three samples were imaged, including 13 samples from a decompositional study conducted 5 years previous, and 10 “fresh” samples collected from a commercial butcher. This part of the study determined that protein and organic components of the bone could be fluoresced and diagenetic alteration could be imaged. The second part of the study used human samples as a means of imaging and mapping diagenetic alterations. The second part of the study used 13 samples, including 4 clinical, 7 ancient, and 2 modern controls. The pig study used Basic Fuchsin and SlowFade Gold stains, while the human study used toluidine blue. Images were also taken with unstained elements. The results of the non-human study found that a fresh bone fluoresced differently than that of a 5-year subset, while the results of the human study confirmed these findings and determined that the bone diagenesis can be mapped using LSCM. 相似文献
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Ashley T. Rubin 《Law & society review》2019,53(2):518-553
The well‐known gap between law on the books and law in action often casts doubt on the significance of changes to law on the books. For example, the rise and fall of penal technologies have long been considered significant indicators of penal change in socio‐historical analyses of punishment. Recent research, however, has challenged the significance of apparently large‐scale penal change of this kind. This article clarifies the significance of penal technologies' rise and fall by offering an alternative account of formal penal change, introducing the analytical concept of “legal templates,” structural models of legal activity (e.g., punishment) available for authorization and replication across multiple jurisdictions. Analyzing punishment's templates explains how new penal technologies can be important harbingers of change, even when they fail to revolutionize penal practice and are not caused by a widespread ideological shift. This article locates the significance of punishment's legal templates in their constitutive power—their ability, over the long term, to shape cognitive‐cultural expectations about what punishment is or should be. This power appears only when the template is widely adopted by a plurality of jurisdictions, thereby becoming institutionalized. Ultimately, these institutionalized templates define the scope of future punishment. 相似文献