The reincorporation and redistribution of trace geoforensic particulates on clothing: An introductory study

Two experimental studies were undertaken to investigate the processes of reincorporation and redistribution of trace evidence on garments when worn by a suspect or a victim (reincorporation) or after the garments have been seized and packaged for subsequent forensic analysis (redistribution). The first experiment utilised UV powder, an established proxy for geoforensic trace particulates and the second experiment utilised daffodil pollen transferred onto garments under conditions that mimicked forensic reality. It was demonstrated that reincorporation of trace particulates occurs from upper to lower parts of the same garment and also from upper garments to lower garments. Reincorporation also occurred to all areas of the lower garments, however the highest concentration of particulates was found to be the lap area of the jeans. Particulates also tended to be preserved around technical details such as stitching or relief design features of the garments. Thus the decay of particulates after a contact has been made does not necessarily involve a loss of those particulates from the entire system. These findings have implications for the interpretation of trace evidence when seeking to establish the source of initial contacts or the chronology of pertinent events. The second study demonstrated that folding and packaging items of clothing leads to a redistribution of any trace particulate evidence that is present thereby eliciting an alteration in the spatial distribution of that evidence. There is therefore a necessity to take the context of trace evidence into account and also to follow protocols that are sensitive to these aspects of trace evidence behaviour as a failure to do so may have consequences for the correct interpretation of such evidence.     

Fourier transform infrared analyses of some particulate drug mixtures using a diamond anvil cell with a beam condenser and an infrared microscope.

Although the diamond anvil cell (DAC) has been used in many forensic science laboratories for the analysis of trace evidence, few applications of this technique for the analysis of controlled substances have been reported. This may be due to both an unfamiliarity on the part of forensic drug chemists with this accessory and the nature and quality of spectra that result from use of a DAC on a dispersive instrument. Along with low energy throughput, which results in relatively high noise levels, strong broad diamond absorptions occur. With the use of a Fourier transform infrared instrument, these do not present a problem and nanogram quantities of materials can be analyzed when the DAC is used with an infrared microscope. Since single crystals can be sampled with the DAC, simple physical separations (involving particle-picking) can be used in certain cases to isolate drugs from particulate mixtures for infrared analysis. This method is especially useful for some "difficult" mixtures and residues, and several examples of such analyses involving samples of forensic science interest are presented.     

The relevance of the evolution of experimental studies for the interpretation and evaluation of some trace physical evidence

In order for trace evidence to have a high evidential value, experimental studies which mimic the forensic reality are of fundamental importance. Such primary level experimentation is crucial to establish a coherent body of theory concerning the generation, transfer and persistence of different forms of trace physical evidence. We contend that the forensic context, at whatever scale, will be specific to each individual forensic case and this context in which a crime takes place will influence the properties of trace evidence. It will, therefore, be necessary in many forensic cases to undertake secondary level experimental studies that incorporate specific variables pertinent to a particular case and supplement the established theory presented in the published literature. Such studies enable a better understanding of the specific forensic context and thus allow more accurate collection, analysis and interpretation of the trace physical evidence to be achieved.This paper presents two cases where the findings of secondary level experimental studies undertaken to address specific issues particular to two forensic investigations proved to be important. Specific pre-, syn- and post-forensic event factors were incorporated into the experimental design and proved to be invaluable in the recovery, analysis and in achieving accurate interpretations of both soil evidence from footwear and glass trace evidence from a broken window.These studies demonstrate that a fuller understanding of the specific context within which trace physical evidence is generated and subsequently collected, as well as an understanding of the behaviour of certain forms of trace physical evidence under specific conditions, can add evidentiary weight to the analysis and interpretation of that evidence and thus help a court with greater certainty where resources (time and cost) permit.     

Nanomanipulation‐Coupled Nanospray Mass Spectrometry Applied to the Extraction and Analysis of Trace Analytes Found on Fibers*

Abstract: This article presents the novel instrumentation of nanomanipulation coupled to nanospray ionization‐mass spectrometry, which is used to directly probe trace analytes found on individual fibers. The low detection limits and sample volumes associated with nanospray ionization‐mass spectrometry make it the ideal instrument to implement for trace analysis. Nanospray ionization‐mass spectrometry, coupled with the nanomanipulator, allows for the direct probing of trace particulates on fibers. The technique is demonstrated by dissolving an electrostatic particle of cocaine from a fiber, collecting the analyte solution in a nanospray tip, and transferring the tip directly to the mass spectrometer to complete analysis. The utility of this technique is evident through the minimal sample preparation and short analysis time. The use of nanomanipulation coupled to nanospray ionization‐mass spectrometry could improve on current trace particulate analysis by reducing both detection limits and sample size required to complete analysis.     

The recovery of pollen evidence from documents and its forensic implications

Three experiments were undertaken to establish the potential for forensic palynological analysis in cases of suspected document fraud. The first study tested 6 different types of paper and 9 different types of ink (n = 54) and it was established that the best retainer of particulates (in this case a proxy was used in the form of UV powder) was medium biro ink and Wove and Connoisseur paper. It was found that for the different paper types 42–52% of the particulates collected were found in the ink and thus both the paper and the ink are potentially valuable sources of trace evidence in a forensic investigation. The second study sought to address the differences in the spatial distribution of particulates on documents when writing took place before or after the paper was treated with UV particulates. Ninety-six observations were made for each piece of paper tested and it was found that when the writing took place after the particulates were applied to the paper; more particulates were retained on the paper in contrast to when the writing took place before the particulate treatment. The spatial distribution of particulates was also affected, with particulates being retained in the folds of the paper when the writing took place before particulate treatment in contrast to a more erratic pattern that emerged due to the pressure of the hand of the writer when the writing took place after the particulate treatment. The third study utilised lily (Lilium) pollen grains and the findings broadly concurred with the second study. The main difference identified was when the writing took place before the particulates were applied; when UV powder was used the particulates were retained in the folds of the paper whereas this pattern was not seen to the same degree when pollen grains were used due to their ‘stickier’ nature. Envelopes and the pen nibs were also found to be rich sources of pollen grains after the experiments were undertaken.These studies have implications for the application of forensic palynology in cases of suspected document fraud. Pollen grains may well be present, and their analysis has the potential to reveal not only the timing of the generation of the document, but the spatial trends revealed indicate that it may well be possible to establish the sequence of significant events for forensic reconstruction. As such forensic palynology is demonstrated to have great potential in aiding forensic investigations, and is as yet an under-utilised form of trace evidence.     

Informal transfers,men, women and children: Family economy and informal social security in early 20th century Finnish households

Due to their role in discussions on community solidarity and social security in rich and poor countries alike, informal transfers between households have gradually become established as a research topic in economic and social history. Qualitative research has tended to emphasize the female-dominated nature of informal assistance. While research on intra-household resource allocation has demonstrated the potential for discerning gendered outcomes with household level data, quantitative research on informal assistance tends to ascribe a singular, “family” logic to transfers. Using an early 20th century Finnish household budget survey, this article analyses the differences in the statistical determinants of the reception of informal transfers in cash and in kind in the context of gendered household economy. Record linkage and statistical inference are utilized to reveal the sources of the different types of transfers and show how they were related to the position and welfare of men, women and children within households. The transfers in cash were actually controlled by men in the male breadwinner families of the data, exhibited elements of informal insurance, and were linked to trade union membership. The transfers in kind appeared to be the realm of particularly those women who were mainly engaged in unpaid work in households. At the same time, however, they were linked to outbound reciprocity in cash, indicating implicit dependence on male earnings.     

A method for forensic gasoline comparison in fire debris samples: A numerical likelihood ratio system

In many arson cases gasoline is used as a means to start the fire. In this paper results are presented for a likelihood-ratio (LR) system aimed at comparing gasoline traces from fire debris to a reference gasoline. The LR-system is able to deal with disturbing effects caused by burning and exposure to surroundings: pyrolysis products, preferential adsorption and evaporation. This paper focusses on the criminalistic and statistical aspects of the design of the LR-system, and presents results on performance of the LR-system. The details of trace gasoline recovery from fire debris will be presented in an accompanying paper.Validation and performance measures show that this system gives well-calibrated LRs for comparisons involving trace samples with a spread in quantity of gasoline, evaporation levels, and matrices that are typically encountered in casework. Rates of misleading evidence are less than 3.5%.We conclude that, despite limitations in experimental design, this LR-system can be useful to the comparison of gasoline profiles in casework practice.     

The Social Licence as a Form of Regulation for Small and Medium Enterprises

Traditional forms of regulation have been criticized for not adequately protecting the environment. Indeed, there is evidence and growing support for the view that societal pressure can act as a social licence which induces 'beyond compliance' behaviour. In exploring this view, the paper (a) outlines the characteristics of the social licence; (b) assesses how these characteristics can influence the environmental behaviour of small and medium enterprises; (c) presents a model which shows that social licence pressures depend on the interplay of a range of factors; and (d) applies the model to explain why societal pressures rarely induce beyond compliance environmental behaviour among small and medium enterprises.     

Selfish and Indoctrinated Economists?

Many people believe that economists in general are more selfish than other people and that this greater selfishness is due to economics education. This paper offers empirical evidence against this widely held belief. Using a unique data set on giving behaviour in connection with two social funds at the University of Zurich, it is shown that economics education does not make people act more selfishly. Rather, this natural experiment suggests that the particular behaviour of economists can be explained by a selection effect.JEL Classification: A13, A20, H41     

Social ties and short‐term self‐reported delinquent behaviour of personality disordered forensic outpatients

Purpose. In community‐based forensic psychiatry, patients' social ties are considered as protective factor in a risk management strategy. However, it is unknown whether these ties actually assist patients to refrain from re‐offending. We hypothesised a protective role for social ties in re‐offending behaviour. Methods. In a sample of forensic outpatients with a personality disorder (N = 55), the relationship between social ties (social contacts and participation in social institutions) and short‐term self‐reported re‐offences was studied within a prospective study design with a 6‐month follow‐up period. Results. Our results provide evidence for a protective function of club participation. For violent re‐offences, social institutions were protective and this protective function remained, even when a patient had network members with a criminal background. Except for work‐related contacts, social contacts did not provide protection. Conclusions. The protective effect of social ties, especially club participation, on desistance from re‐offending in forensic psychiatric patients merits further attention from researchers and clinicians.     

Trace evidence: Here today,gone tomorrow?

The recent report of the National Research Council of the US National Academies “Strengthening Forensic Science in the United States: a Path Forward” found evidence that the level of scientific development and evaluation varies substantially among the forensic science disciplines. In this paper the status of trace evidence will be reviewed from an international perspective with particular reference to case studies. The paper will argue that the trace evidence discipline needs to learn from past experience and that serious coordinated action is required at an international level if trace evidence is to continue to meet the standards expected of forensic science in the future. The paper concludes that it is vital that trace evidence remains a key component of forensic investigation due to its important role in addressing the ‘what happened’ question.     

Is it complex environments or complex systems that undermines police reform in developing countries?

This article is a reflection upon the challenges facing police reform in developing countries. In doing so it explores the usefulness of complexity theory both to understand the evidence of relative failure and to reconsider the explanations offered for that failure in terms of unique individual factors or the complex nature of the environment. The article suggests that the nature of police organisations as complex social systems may be a principal reason for failure. The article outlines some of the key features of complex systems and illustrates these from actual police reform. The article then turns to whether complexity theory can be of any practical use in police reform programmes. It concludes that greater success may be forthcoming if the insights of complexity theory are taken on board by reformers.     

Evidentiary value of the contents of hollow-point bullets

The fortuitous recovery of material trapped within the cavity of a hollow-point bullet at autopsy was demonstrated to be of evidentiary value. Analysis of this material, as well as that from hollow-point bullets from test-firings, showed that the contents, especially if in multiple layers, could be correlated with the series of intermediate targets perforated. In the case presented, this aided investigators in determining how many bullets actually struck the victim. Frequently displaced, especially if distortion of the hollow point has occurred, this tidbit of trace evidence is worth recovering and analyzing.     

交通事故中摩托车司乘人员致伤方式分析

通过对3例摩托车交通事故中司乘人员的损伤特征及车辆痕迹的检验结果比对,分析事故过程中摩托车司乘人员的运动过程及致伤方式,发现因其位置、姿势和应激状态不同,摩托车驾驶位乘员与后座乘员在碰撞、运动过程中损伤形成不同,其人体成伤机制、部位及程度与车辆相关部位的损害痕迹可以相互佐证,对于推断摩托车司乘人员的行为方式(谁是摩托车驾驶员)具有重要价值。进一步总结此类事故鉴定的共同特点,可为事故责任认定提供参考。     

Technological Transfers from the European Space Programs: A Dynamic View and Comparison with Other R&D Projects

This article presents the results and lessons learned from a series of studies carried out by the BETA research team (University Louis Pasteur of Strasbourg, France) to measure the spin-offs and technological transfers that resulted from European space programs. Beyond the quantitative results that are analyzed in detail, the article examines some of the main qualitative characteristics that shape the technology transfer process generated by these programs. In particular, it is demonstrated that three main characteristics have a significant impact on the technology transfer process: the nature of the technologies at stake (their degree of maturity, their degree of diversity, the extent to which they are generic or specific), the nature of the network of participants to the programs (the degree of mutual trust, the existence of absorptive capabilities) and the nature of the organizational structure of those firms which participated in the projects (their degree of decentralization, their degree of vertical integration).The article concludes by discussing how these lessons learned could be used to shape the procurement policies to be followed by space agencies in order to favor a high potential for technological transfers arising from future space projects.     

Open access, social norms and publication choice

The aim of this paper is to shed light on scholarly communication and its current trajectories by examining academics’ perception of Open Access, while also providing a reference case for studying social norm change. In this respect, the issue of publication choice and the role of Open Access journals casts light on the changes affecting the scientific community and its institutional arrangements for validating and circulating new research. The empirical investigation conducted also offers a useful vantage point for gauging the importance of localised social norms in guiding and constraining behaviour.     

Recovery of trace DNA and its application to DNA profiling of shoe insoles

In recent years, the analysis of trace amounts of DNA has become a necessary and useful forensic tool. DNA profiles can be obtained from items that have been worn or handled, due to the presence of transferred DNA derived from skin cells. Shoeprints collected from crime scenes that match a suspects shoe can link a shoe to the crime scene. A DNA profile from inside the shoe can link a wearer to a shoe thus increasing the evidential value of the forensic evidence. In this work, variation in the amount of DNA recovered from hands and feet of different individuals is investigated. Sites for sampling DNA from shoe insoles are compared and a protocol for the subsequent sampling and extraction is developed. Finally, a case study is described where DNA analysis of shoe insoles has provided forensic evidence.     

The natural sampling of airborne trace signals from explosives concealed upon the human body.

An experimental study of the natural sampling of trace signals from explosives concealed upon the human body was performed by taking proper account of the thermal behavior of the air surrounding the human body and the particles therein. Experiments were conducted in a dispersal chamber to identify variables affecting the detectibility of concealed RDX and TNT patches. Movement by human volunteers was found to enhance the available explosive trace signal above a baseline level. Clothing blocked some of this movement-generated trace signal. The detected signal levels were also found to vary significantly from volunteer to volunteer, indicating that human variability is an issue in explosive trace detection. Further, under the conditions studied here, the detectibility of RDX and TNT was dependent upon the efficient sampling of contaminated particulate matter, not the vapor phase. The present results are now being applied to the design of a practical, nonintrusive trace detection portal for aviation security screening and related applications.     

DNA evidence, probabilistic evaluation and collaborative tests

Forensic scientists working in 12 state or private laboratories participated in collaborative tests to improve the reliability of the presentation of DNA data at trial. These tests were motivated in response to the growing criticism of the power of DNA evidence. The experts' conclusions in the tests are presented and discussed in the context of the Bayesian approach to interpretation. The use of a Bayesian approach and subjective probabilities in trace evaluation permits, in an easy and intuitive manner, the integration into the decision procedure of any revision of the measure of uncertainty in the light of new information. Such an integration is especially useful with forensic evidence. Furthermore, we believe that this probabilistic model is a useful tool (a) to assist scientists in the assessment of the value of scientific evidence, (b) to help jurists in the interpretation of judicial facts and (c) to clarify the respective roles of scientists and of members of the court. Respondents to the survey were reluctant to apply this methodology in the assessment of DNA evidence.