Latent Fingermark Aging Patterns (Part I): Minutiae Count as One Indicator of Degradation

The authors are exploring degradation patterns of latent fingermarks over time which can be quantitatively determined in a predictable manner by visual means. Several physical degradation parameters for assessing this hypothesis are evaluated. This article analyzes the parameter “minutiae count” as a function of time. Experiment variables included were secretion type (sebaceous‐rich and eccrine‐rich), substrate (glass and plastic), and exposure to light (dark, shade, and direct light). Depositions were sequentially visualized with Titanium Dioxide powder over a period of 6 months, photographed, and number of minutiae recorded. Results revealed a significant decrease of minutiae for eccrine‐rich marks on glass but insignificant for sebaceous‐rich marks on the same surface. However, significant degradation was observed for both types of secretions on plastic. The authors conclude that the distinctive prevalence of minutiae changes over time indicates with a high degree of certainty the hypothesis is valid and deserves additional exploration.     

Wrongful convictions and claims of false or misleading forensic evidence

The results are reported of a study to examine case factors associated with 732 wrongful convictions classified by the National Registry of Exonerations as being associated with “False or Misleading Forensic Evidence.” A forensic error typology has been developed to provide a structure for the categorization and coding of factors relating to misstatements in forensic science reports; errors of individualization or classification; testimony errors; issues relating to trials and officers of the court; and evidence handling and reporting issues. This study, which included the analysis of 1391 forensic examinations, demonstrates that most errors related to forensic evidence are not identification or classification errors by forensic scientists. When such errors are made, they are frequently associated with incompetent or fraudulent examiners, disciplines with an inadequate scientific foundation, or organizational deficiencies in training, management, governance, or resources. More often, forensic reports or testimony miscommunicate results, do not conform to established standards, or fail to provide appropriate limiting information. Just as importantly, actors within the broader criminal justice system—but not under the purview of any forensic science organization—may contribute to errors that may be related to the forensic evidence. System issues include reliance on presumptive tests without confirmation by a forensic laboratory, use of independent experts outside the administrative control of public laboratories, inadequate defense, and suppression or misrepresentation of forensic evidence by investigators or prosecutors. In approximately half of wrongful convictions analyzed, improved technology, testimony standards, or practice standards may have prevented a wrongful conviction at the time of trial.     

潜在手印残留物中的油脂成分研究

潜在手印在现场上出现的频率较高,科学、合理地显现和提取现场手印对于认定犯罪具有重要意义。为了提高现场手印的提取率和利用率,有必要分析潜在手印残留物中油脂成分的变化(如鲨烯、十四酸、棕榈酸、十八酸、棕榈油酸、油酸成分的出现率及其含量随时间的变化等),为研究针对潜在手印油脂成分的专一性显现方法及分析潜在手印的物质成分、新旧程度等提供理论支持,进而提高现场潜在手印的提取率和显现率。     

Exploring gender differences in constellations of problem behaviors and associated health-related factors during adolescence

Using data from the National Longitudinal Study of Adolescent Health (Add Health), this study expands on previous research on adolescent problem behavior by (1) examining gender differences in patterns or ‘subgroups’ of adolescents based on self-reported problem behaviors and (2) identifying differences in health-related factors including service utilization, physical and mental health, and violent victimization across the identified gender-specific subgroups. The data used in this study were taken from Wave 2 of the National Longitudinal Study of Adolescent Health (Add Health) data and includes respondents under the age of 18 (n?=?10,360). Based on 16 problem behavior items measuring delinquency, substance use, risky sexual practices, and status offending, latent class analyses identified a 4-class model for the male subsample and a 3-class model for the female subsample. Important differences in health-related factors were observed across the latent classes. However, these differences were fairly consistent for boys and girls. Implications for prevention and intervention strategies, specifically focusing on the intersection of juvenile justice and public health services, are discussed.     

潜血印迹显现方法研究进展

潜血印迹一般出现在恶性刑事案件当中,能够反映与案件有关的多方面信息,对于同一认定和分析判断案情具有十分重要的作用,这就使得其显现成为现场勘查的一项必不可少的工作。然而,这也正是公安实践工作当中的难点所在。经过多年的实验研究,目前国内外针对于潜血印迹的显现方法主要包括光学显现法和化学显现法。综述了这些常用显现方法的研究进展,并且讨论了每种显现方法在实践工作当中的优势和不足。     

Development of Latent Fingermarks from Rocks and Stones

Since the beginning of recorded history, stones have been used in the commission of crimes due to their widespread availability. Stones can be used as a lethal weapon that sometimes might be the only evidence in a serious case. The common perception, even in professional fingermark circles, is that stones do not yield identifiable latent fingermarks. The authors of this research paper examined the feasibility of developing fingermarks from seven types of stones using three latent fingermark techniques: magnetic powder, cyanoacrylate fuming, and ninhydrin. The paper will demonstrate that by classifying stones and rocks according to their natural properties (porosity, permeability, and the nature of surface area), even application of the simplest development techniques can produce good results. In conclusion, chert and limestone yielded the most qualitative and quantitative results using magnetic powder. The time factor is also important in recovering latent fingermarks on stones and rocks.     

Internal or External Production and Satisfaction with the Chosen Sourcing in Danish Municipalities: Different Theoretical Explanations

Abstract

There is a large literature on both why local governments and public organisations choose internal or external production of services and what explains the performance of internal and external production. A range of different theories have been used to answer these questions. However, these studies show mixed results. In this study we investigate four theories: transaction cost economics, neoclassical economics, the resource-based view of strategy and institutional theory. Can these theories explain whether local governments choose internal or external production and can they explain the satisfaction with the internal and external production? Do the same variables explain the choice and the satisfaction? Based on a survey of four different service areas in Danish municipalities, it is shown that different theoretical variables explain the choice and satisfaction with the sourcing mode. Internal expertise is strongly related to the choice of internal or external production, whereas most transaction cost variables are unrelated to this choice. However, other variables such as supplier expertise and technological uncertainty are related to satisfaction with service production. The results corroborate the view that different variables are needed for explaining the performance of suppliers and the choice between internal and external suppliers. Furthermore, the results suggest that the study of local governments' sourcing may benefit from integrating theories focusing on internal expertise and markets. Studies may also benefit from integrating economic theories, which assume rationality, with institutional theory emphasising more unreflective and socially determined behaviour.     

The internal consumer response process: Towards an integrated conceptual model

Abstract

Most existing consumer response models explain consumer response processes in a simplistic linear and sequential manner (Strong 1925; Lavidge & Steiner 1961; Rogers 1962; McGuire 1978; Ray 1973; Smith & Swinyard 1982; Vaughn 1980; Petty & Cacioppo 1983; Preston 1982; Moriarty, Mitchell and Wells 2008), ignoring variables or factors which could alter the response process order. Although various theorists criticised existing consumer response models mainly because of this (Belch & Belch 2001; Hanekom 2006; Hanekom, Barker & Angelopulo 2007; Moriarty et al. 2008; Del Barrio-Garcia & Luque-Martinez 2003; Mortimer 2002; Wu [sa]; Bendixen 1993; Wilmshurst 1985), no efforts have been made to develop a conceptual model to address these limitations. The main objective of this article is, therefore, to develop an integrated conceptual model for the internal consumer response process through a comprehensive qualitative literature review and theoretical analysis of existing advertising response models. This model integrates existing and original consumer response levels and phases, and appends specific variables to each response level that influence the manner in which consumers internally proceed through the diverse response processes. Furthermore, the proposed model will allow the execution of more specific objectives which include (a) to propose a paradigm shift from advertising consumer response models to integrated marketing communication response models; (b) to systematise existing consumer response models by arranging them into three proposed paradigms, based on their focal aim; and (c) to develop an integrated marketing communication internal consumer response model, depicting eight internal consumer response levels, consisting of diverse internal consumer response phases.     

Weak States,State Failure,and Terrorism

It is common to hear the assertion that weak or failed states are fertile ground for terrorism. Yet terrorist groups have emerged from, and operated within, countries which have strong, stable states and a variety of systems of government. Terrorist organizations operate in weak and failed states but it is not necessarily the condition of weak or failed statehood which explains their presence. Moreover, it is not necessarily the weakest states which do host such groups. Therefore, this condition is not a sufficient explanation for their presence. While weak or failed states might provide an enabling environment for certain types of terrorist groups to operate, additional explanatory variables need to be identified.     

彩色背景客体上手印的显现方法

目的利用真空金属镀膜法和＂502＂胶熏显法之间的空间互补性原理,考察显现杂色背景客体表面潜手印过程中遇到的杂色背景干扰问题。方法对杂色背景客体表面的同一枚手印分别采用紫外照相、＂502＂胶熏显、真空镀膜方法处理,比较去除背景干扰能力。结果采用＂502＂胶熏显,真空金属镀膜后期增强处理,能够使指纹纹线清晰连贯,并能有效消除背景杂色干扰。结论该方法可有效消除背景杂色干扰,清晰显现有彩色背景的易拉罐、照片纸等客体上的指纹。