A review of quality procedures in the UK forensic sciences: What can the field of digital forensics learn?

With a reliance on the various forms of forensic science evidence in complex criminal investigations, the measures for ensuring its quality are facing increasing scrutiny. Improvements to quality management systems, to ensure both the robust application of scientific principles and the accurate interpretation and reporting of results, have arisen as a consequence of high-profile rebuttals of forensic science evidence, combined with process improvements driven by evaluation of current practice. These improvements are crucial to ensure validity of results as well as providing assurance for all those involved in the Criminal Justice System. This work first examines the quality management systems utilised for the examination and analysis of fingerprint, body fluid and DNA evidence. It then proceeds to highlight an apparent lack of comparable quality assurance mechanisms within the field of digital forensics, one of the newest branches of forensic science. Proposals are provided for the improvement of quality assurance for the digital forensics arena, drawing on the experiences of, and more well-established practices within, other forensic disciplines.     

Two-dimensional metric comparison between dynamic bare and sock-clad footprints for its forensic implications – A pilot study

Footprints may be present at crime scenes as physical evidence. This pilot study compares two-dimensional measurements of bare and sock-clad footprints to determine if significant differences or similarities exist. Dynamic footprints were collected from 30 males and 20 females between the ages of 20 and 61?years old (mean of 28.2?years) using the Identicator Inkless Shoe Print Model LE 25P system. A midgait protocol was employed for obtaining footprints. The fifth and sixth footprint of gait were collected for the right and left foot, respectively, in both sock-clad and barefoot trials. The footprint measurements between sock-clad and bare footprints were compared. The results did not indicate any significant difference (p?>?.05) between bare and sock-clad foot length measurements for right or left feet. Significant differences were seen for the width measurements between bare and sock-clad footprints. These findings have forensic implications, particularly in criminal cases where it is unclear if a footprint impression is from a sock-clad foot or a bare foot. This study shows that such a determination is generally not necessary when utilizing two-dimensional measurements for length comparison between a bare and sock-clad footprint. However, if width measurements are being evaluated, the distinction between bare and sock-clad footprints should be considered.     

Tippins and Wittman Revisited: Law,Social Science,and the Role of the Child Custody Expert 14 Years Later

It has been 14 years since Tippins and Wittmann ( 2005 ) voiced concern for the overreaching role the expert may play in matters of family law. This article sets their levels of inference within the context of the culture of both law and social science. We examine how inferences are impacted by the relative emphasis child custody experts give to the five stakeholders involved in child custody evaluations (CCEs): courts, lawyers, parents, children, and professional governing bodies. Acculturation of the assessor to law contributes to more egregious inferences, versus the more modest ones Tippins and Wittmann advocated. How evaluators prioritize stakeholders shapes their opinion and methodology. We offer an expanded perspective that views how their levels of inference are manifest in reports, methodology, and recommendations and the influence of the culture of law and the mindset of the clinician. We hope to encourage clinicians to find ways to operationalize clinical humility, assume their proper role, and remain true to their master identity as licensed mental health professionals and their proper sphere of authority.     

A systematic review of effective therapeutic interventions and management strategies for challenging behaviour in women in forensic mental health settings

Women in secure forensic mental health care require therapy and care that is responsive to their specific needs. Despite the policy recognition that women require a distinct service, evidence based practice is not available for this population. This review was undertaken in response to a clinical need within a medium secure unit in Glasgow that was experiencing high levels of challenging behaviour, in a female ward. The review aimed to identify effective strategies or interventions for the management of challenging behaviour in women in secure services and, therefore, improve practice and patient care. A synthesis of the findings from the 11 identified studies revealed variability in the approaches used to support women in forensic services, including: behavioural programmes; organisational change with a focus on staff training and support; medication; ECT and mechanical restraint. The challenging behaviours assessed included self-harm; physical and verbal aggression; suicide attempts and arson/fire setting. The majority of articles suggested some improvement in aspects of challenging behaviour, however this was limited by the lack of control groups and small sample sizes. Further investigation is required to find out whether interventions identified in this review can sustain a reduction in challenging behaviours in the long-term.     

“The big sleep: Elucidating the sequence of events in the first hours of death to determine the postmortem interval”

Recent developments on postmortem interval estimation (PMI) take an advantage of the autolysis process, pointing out to the analysis of the expression of apoptosis and autophagy genes towards this purpose. Oxidative stress plays a role in this signaling as a regulatory mechanism and/or as a consequence of cell death. Additionally, melatonin has been implicated on apoptosis and autophagy signaling, making melatonin a suitable target for PMI determination. The aim of this study was to investigate the early PMI through the analysis of the expression of autophagy genes as well as oxidative stress and melatonin receptor. Our results demonstrated a rapidly increased on the expression of autophagy genes according to the expected sequence of events, then a marked decrease in this expression, matched with the switch to the apoptosis signaling. These results revealed potential candidates to analyze the PMI in the first hours of death, helping to estimate the time-since-death.     

Forensic anthropology in the global investigation of humanitarian and human rights abuse: Perspective from the published record

Forensic anthropologists have played key roles in the historical development of forensic science applications to global humanitarian and human rights issues. These anthropological initiatives can be traced back to the Smithsonian seminar organized by T. D. Stewart in 1968 and published in 1970. Key developments include the 1984 delegation sent by the American Association for the Advancement of Science to Argentina and the formation of the Argentine Forensic Anthropology Team. Subsequent highlights include major anthropological involvement in support of investigations by international criminal tribunals, formation of forensic anthropology teams in different countries and activities of the International Commission of Missing Persons and the forensic unit of the International Committee of the Red Cross. Recent developments feature the formation of the Humanitarian and Human Rights Resource Center of the American Academy of Forensic Sciences and its support of worthwhile projects in many countries. The published record provides historical perspective on these developments.     

Targeting relevant sampling areas for human biological traces: Where to sample displaced bodies for offender DNA?

Sampling strategy is one of the deciding factors in DNA typing success rates. Small amounts of bodily fluid traces and (skin) contact traces are currently not visualized in standard forensic practice. Trace recovery is usually based on the information available in a particular case and on the experience and ‘forensic common sense’ applied by the trace recovery expert. Interactions between an offender and a victim may have characteristic features, resulting in specific trace patterns. Understanding these interactions, and their resulting trace patterns, might improve crime related trace recovery as well as DNA typing success rates.In this study, we examined the interactions between offender and victim when a body has been relocated from one position/location to another. The contact between the hands of the offender and the body of the victim was visualized using a fluorescent dye in a lotion that was applied to the hands of the individual undertaking the relocation. The contact locations were scored and patterns were analyzed based on both victim and offender characteristics (height, weight, age, gender). The resulting patterns were compared to current trace recovery practices in the Netherlands. The results of this large-scale study facilitate evidence-based sampling supporting both investigative and evaluative forensic examinations.     

Intra‐ and Inter‐Element Variability in Mitochondrial and Nuclear DNA from Fresh and Environmentally Exposed Skeletal Remains,

Successful identification of skeletonized remains often relies upon DNA analyses, frequently focusing on the mid‐diaphysis of weight‐bearing long bones. This study explored intra‐bone DNA variability using bovine and porcine femora, along with calcanei and tali. DNA from fresh and short‐term environmentally exposed bone was extracted utilizing demineralization and standard lysis buffer protocols, and DNA quantity and quality were measured. Overall, femoral epiphyses, metaphyses, and the tarsals had more nuclear and mitochondrial DNA than did the femoral diaphyses. DNA loss was much more rapid in buried bones than in surface exposed bones, while DNA quality differed based on environment, but not bone region/element. The demineralization protocol generated more DNA in some bone regions, while the standard lysis was more effective in others, and neither significantly affected DNA quality. Taken together, these findings reinforce the importance of considering inter‐ and intra‐bone heterogeneity when sampling skeletal material for forensic DNA‐based identifications.     

Genetic variation of 23 STR loci in a Northeast Colombian population (department of Santander)

The most efficient markers to solve filiation cases are the STRs, including complex cases that require the analysis of a greater number of markers. In this study samples from 123 unrelated individuals from the department of Santander (northeast Colombia) were typed for 23 autosomal STRs included in VeriFiler express kit (Thermo Fisher Scientific),and their allele frequencies and parameters of forensic relevance were determined. Results demonstrate independence within and between the loci analyzed, and the accumulate power of exclusion for the full set of markers was high (99.9996%), as well as the match probability, which was 1 in 8.77E + 29. Therefore, this northeast Colombian population database can be used in forensic to estimate the frequency of the genetic profile using of a multiple locus including in this DNA kit.