Detecting buried metallic weapons in a controlled setting using a conductivity meter

Forensic personnel may face a daunting task when searching for buried weapons at crime scenes or potential disposal sites. In particular, it is common to search for a small firearm that was discarded or buried by a perpetrator. When performing forensic searches, it is recommended to first use non-invasive methods such as geophysical instruments to minimize damage to evidence and to the crime scene. Geophysical tools are used to pinpoint small areas of interest across a scene for invasive testing, rather than digging large areas throughout the site. Prior to this project, there was no published research that tested the utility of the conductivity meter to search for metallic weapons such as firearms and blunt and sharp edged weapons. A sample comprised of 32 metallic weapons including firearms, blunt and sharp edged weapons, and scrap metals was buried in a controlled setting to test the applicability of a conductivity meter for forensic searches. Weapons were tested at multiple depths and after data collection was performed for one depth, the weapons were reburied 5 cm deeper until they were no longer detected. Variables such as weapon size, burial depth, transect interval spacing (25 and 50 cm), and metallic composition were tested. All of the controlled variables influenced maximum depth of detection. For example, size was a factor as larger weapons were detected at deeper depths compared to smaller weapons. Metal composition affected maximum depth of detection as the conductivity meter detected items comprised of ferrous metals at deeper depths than non-ferrous metals. Searches for large buried items may incorporate a transect interval spacing of 50 cm but small weapons may be undetected between transects and therefore a transect interval spacing of 25 cm is recommended. Overall, the conductivity meter is a geophysical tool to consider when searching for larger-sized metallic weapons or to use in conjunction with an all-metal detector, particularly when searching for buried metallic evidence in obstructed areas.     

Violent Crime in the Urban Community: A Comparison of Stockholm and Basel

In this article the authors present some preliminary findings from a comparative study of police recorded violent crimes in Stockholm and Basel. They present the first results from a comparative analysis of the situational context, the ecology of crime, and of offender residences in these cities. There is impressive evidence of basic similarities in the situational context of violent crime and the residential distribution of violent offenders. Yet there are also significant differences, some of which may have interesting implications for crime prevention. Firstly, violent crime seems to be more highly concentrated during weekend nights in Stockholm than in Basel. Secondly, they find evidence that the presence of weapons in a community increases the risk of more serious outcomes of violent events. Efforts to reduce the availability of weapons may thus have significant effects on the outcomes of violence, but not necessarily on its frequency. Thirdly, they show that offenders in both cities are highly concentrated in socially disorganised communities with few economic and social resources.     

Prisons and Crime, Backwards in High Heels

Objectives

Prisons reduce crime rates, but crime increases prison populations. OLS estimates of the effects of prisons on crime combine the two effects and are biased toward zero. The standard solution—to identify the crime equation by finding instruments for prison—is suspect, because most variables that predict prison populations can be expected to affect crime, as well. An alternative is to identify the prison equation by finding instruments for crime, allowing an unbiased estimate of the effect of crime on prisons. Because the two coefficients in a simultaneous system are related through simple algebra, we can then work backward to obtain an unbiased estimate of the effect of prisons on crime.

Methods

Potential instruments for crime are tested and used to identify the prison equation for the 50 U.S. states for the period 1978–2009. The effect of prisons on crime consistent with this relationship is obtained through algebra; standard errors are obtained through Monte Carlo simulation.

Results

Resulting estimates of the effect of prisons on crime are around ?0.25 ± 0.15. This is larger than biased OLS estimates, but similar in size to previous estimates based on standard instruments.

Conclusions

When estimating the effect of a public policy response on a public problem, it may be more productive to find instruments for the problem and work backward than to find instruments for the response and work forward.     

Understanding the risk factors for violence and criminality in women: the concurrent validity of the PCL-R and HCR-20

This study explores the performance of 132 female maximum-security inmates on the Psychopathy Checklist-Revised (PCL-R) and the HCR-20 (Historical, Clinical, and Risk Management Scheme) to examine the concordance between these two risk assessment instruments, and to assess their potential usefulness in determining level of risk for violent behavior and other forms of criminality. The two instruments demonstrated consistent and highly significant correlations across total scores, factor scores, and subscale scores. When the two instruments were entered into a multiple regression analysis to predict violent and non-violent crime, the HCR-20 did not add to the variance explained by the PCL-R. These results confirm earlier research that suggests that there is little or no difference between these two risk assessment instruments in their relationship to community or institutional violence. Further, Receiver Operating Characteristics (ROC) analyses show that both instruments demonstrated an inverse ability to predict convictions for murder, a close to chance ability to predict violent crime, but a shared ability to predict property and minor crime. Broadly, these results suggest that psychopathic women are involved in chronic patterns of non-violent criminality, while women charged and convicted of murder generally do not have elevated scores on the PCL-R or HCR-20. The relevance of these findings to rehabilitation and treatment is discussed.     

PARTICIPATION IN CRIME PARTNERSHIPS BY FEMALE DRUG USERS: THE EFFECTS OF DOMESTIC ARRANGEMENTS,DRUG USE,AND CRIMINAL INVOLVEMENT*

Research findings on the crime patterns of women suggest that social changes in gender roles are associated with increased female criminality. Some researchers note that the increasing participation of women in established criminal organizations increases female crime levels in general, Other researchers demonstrate that involvement with deviant boyfriends or husbands in particular not only introduces women to addictive drugs, but also contributes to greater crime participation. Measures of the domestic network, crime commitment, drug use, ethnicity, and participation in vice and predatory crimes are used to focus on women's formation and participation in crime partnerships. Findings reveal that ethnicity, living with boyfriends or husbands, high levels of crime commission, particularly while carrying weapons, and participating in vice and predatory crimes are factors that are shared by a number of crime partnerships. On the other hand, having children raised by others, a history of incarceration and arrest, and opiate use are factors that are important for specific crime partnerships; therefore, these factors are unique considerations that relate to the likelihood that criminal partnerships will develop.     

Police,Crime and the Problem of Weak Instruments: Revisiting the “More Police,Less Crime” Thesis

Objectives

A key question in the general deterrence literature has been the extent to which the police reduce crime. Definitive answers to this statement, however, are difficult to come by because while more police may reduce crime, higher crime rates may also increase police levels, by triggering the hiring of more police. One way to help overcome this problem is through the use of instrumental variables (IV). Levitt, for example, has employed instrumental variables regression procedures, using mayoral and gubernatorial election cycles and firefighter hiring as instruments for police strength, to address the potential endogeneity of police levels in structural equations of crime due to simultaneity bias.

Methods

We assess the validity and reliability of the instruments used by Levitt for police hiring using recently-developed specification tests for instruments. We apply these tests to both Levitt’s original panel dataset of 59 US cities covering the period 1970–1992 and an extended version of the panel with data through 2008.

Results

Results indicate that election cycles and firefighter hiring are “weak instruments”—weak predictors of police growth that, if used as instruments in an IV estimation, are prone to result in an unreliable estimate of the impact of police levels on crime.

Conclusions

Levitt’s preferred instruments for police levels—mayoral and gubernatorial election cycles and firefighter hiring—are weak instruments by current econometric standards and thus cannot be used to address the potential endogeneity of police in crime equations.

     

Overview of: “Crime Place and Pollution: Expanding Crime Reduction Options Through a Regulatory Approach”

Research Summary Crime reduction policy has focused almost exclusively on offenders. Recent studies and evaluations show that expanding our policy portfolio to include places may be highly productive. We show that there is considerable research showing that crime is concentrated at a relatively few locations, that high-crime places are stable, that changing places can reduce crime, that displacement is not only far from inevitable but also less likely than the diffusion of crime prevention benefits, and that owners of high-crime places can be held accountable for the criminogenic conditions of their locations. We link these findings to environmental policy, where environmental scientists, economists, and regulators have developed a broad set of regulatory options. The core of this article describes a portfolio of environmental policy instruments directly applicable to crime places. We also discuss major decisions local governments will need to make to implement various forms of regulation, and we list challenges that governments must anticipate in planning for such implementation. We argue that a regulatory approach to crime places has the potential to lower the cost to taxpayers of reducing crime by shifting costs from governments to the relatively few place owners whose actions create crime-facilitating conditions. Policy Implications Taking a regulatory approach to crime places substantially expands the crime policy options under consideration. Regulatory options may increase local governments’ effectiveness at reducing crime while reducing governments’ costs. This is because regulatory approaches have the potential to shift some portion of the financial burden for crime fighting to owners of criminogenic locations. Policy makers can select between means-based anticrime regulations that focus on how place owners manage their locations and ends-based regulations that focus on the number of crimes allowed at places. Both of these approaches contain several alternative regulatory instruments, each with its own set of advantages and disadvantages. Experimenting with various regulatory instruments could lead to the development of a range of new crime reduction policies. In addition, a regulatory approach has implications for the funding of policy research. Means-based regulatory instruments require governments to develop evidence that the means they regulate have the desired impact on crime. Ends-based regulatory instruments shift this burden to the regulated places.     

票据犯罪若干问题研究

票据犯罪主体因罪而异 ,有的票据犯罪一般个人主体、一般单位主体不能实施 ,只有特殊个人主体、特殊单位主体才能实施。有的票据犯罪主体必须具有票据当事人身份 ,非票据当事人不能成为该项犯罪主体。票据犯罪罪过形式是故意和过失 ,模糊罪过和混合罪过的观点并不适用刑法所要求的票据犯罪。银行结算凭证虽然不是票据 ,但是应该归属票据犯罪对象范畴。我国刑法应当承认票据无形伪造。     

对作案制式刀具的种类推断

刀具是人们日常生活中常用的工具之一，其种类繁多。功能、形状各异：同时它也是最主要的犯罪工具之一。因此。通过推断作案刀具的种类。来查找和确定犯罪嫌疑人。仍然是案件侦察中的途径之一。而本文从刀具制作行业的角度出发。对几类作案制式刀具的功能、外形结构特点、制作材料．进行了细致的研究。并从痕迹检验的角度出发。重点研究了制式刀具的痕迹形态、特点及特征反映．阐述了制式刀具种类的推断方法。     

Trace DNA: a review,discussion of theory,and application of the transfer of trace quantities of DNA through skin contact

Advances in STR PCR DNA profiling technology allow for the analysis of minute quantities of DNA. It is frequently possible to obtain successful DNA results from cellular material transferred from the skin of an individual who has simply touched an object. Handling objects, such as weapons or other items associated with a crime, touching surfaces, or wearing clothing, may represent sufficient contact to transfer small numbers of DNA bearing cells, or trace DNA, which can be successfully analyzed. With this minimal amount of contact required to yield a suspect profile comes tremendous crime solving potential, and a number of considerations for prudent application, and the maximization of evidentiary value. Evidentiary materials not previously considered must be recognized and preserved, and the resulting DNA type profiles interpreted in their proper forensic context.     

Discounting Women: Context Matters in Risk and Need Assessment

Widely used risk/need assessment instruments assume that female offender risks for recidivism are essentially equivalent to those of male offenders. A look at the lives of female and male offenders reveals that there are important differences in the context of both offending and re-offending. This research draws on both quantitative and qualitative data to explore the effectiveness of a well known risk instrument to both predict recidivism and potentially direct intervention efforts. The results, particularly the in-depth interviews with offenders (both male and female) serving time on parole or felony probation reveal differences not detected by most contemporary risk and need assessment instruments. Ultimately, the gendered links among physical and sexual abuse, drugs, and crime are missed in risk and need assessments, thereby placing female offenders at risk for neglect and criminalization in an otherwise seemingly objective method of assessment.     

Low Crime Rates in Bahrain: Islamic Social Control-Testing the Theory of Synnomie

This pioneer work builds upon the systems of social control (synnomie) developed by Freda Adler (1983). Its intent is to assess the low crime profile of Bahrain and in so doing to offer explanations for this country's low crime rates. While there is crime in Bahrain, this country appears to be the exception to the rule that rapid industrialization breeds high crime. The unique situation in Bahrain will be analyzed by: giving an overview of the country of Bahrain, examining recent crime statistics reported by official agencies in Bahrain, the United States, and in addition, the state of Vermont. The official sources of these data are not considered to be the most reliable indicators of crime, but they are the most comparable. Vermont is used for the comparison of numbers since it has an approximate population to Bahrain.

Low statistics of the amount of crime are reported for Bahrain which form the foundation for this paper. This paper offers possible explanations of low crime by using as its base the theory of synnomie (the consistency of norm and values sharing); and summarizes the main points in this paper and draws conclusions which point in the direction for the future of Bahrain, its citizens, and incidences of reported crime as Bahrain continues with its mission of modernization.     

Vigilante homicides in contemporary Ghana

This article provides a systematic analysis of vigilante homicides that occurred in Ghana, West Africa, during 1990-2000. Through the use of newspaper accounts, the study identified the socio-demographic characteristics of victims, spatial distribution, modus operandi, and the circumstances of death. The data suggested that young urban males suspected or accused of robbery, larceny, and other forms of theft were most often victims of vigilante killings. Mob attacks were spontaneous and the assaults involved the use of weapons available on the scene, such as stones, sticks, clubs, and personal weapons. Factors contributing to the escalation of vigilantism in the society included an under-resourced police force, poor police-civilian relations, burgeoning crime rate, a slow and overburdened judiciary, heightened public fear of crime, and a breakdown in traditional methods of dispute resolution. The article also reports on a survey that targeted the attitudes of a sample of law enforcement officers towards vigilantism in Ghana.     

Evaluation of hair injuries depending on properties of impact surface of a blunt object and impact conditions

We investigated injured hair on crime instruments and head wounds. The findings were confirmed in experiments. Morphological characteristics of hair damage were associated with properties of an impact surface and conditions of the traumas. We propose a new method of registration of blunt head injury. Diagnostic criteria of hair injuries to identify crime instruments and to determine trauma mechanisms are demonstrated.     

论信用证诈骗罪

信用证诈骗罪侵犯的主要客体是国家对信用证的管理制度,在实施骗取信用证进行诈骗时,公私财物的所有权仅是一种选择客体。客观方面表现为《刑法》第１９５条规定的四种方式。信用证诈骗罪在某些情况下也存在既遂、未遂之分。应当区分本罪与伪造、变造金融票证罪的界限。对盗窃他人信用证后又加以使用、利用信用证诈骗银行“打包贷款”的行为应按本罪论处。     

The Impact of the 1994 Federal Assault Weapons Ban on Gun Markets: An Assessment of Short-Term Primary and Secondary Market Effects

The reactions of the gun market, including those of producers, wholesalers, retailers, and consumers, play an important role in shaping the potential impact of gun control policies on gun crime. As a case in point, this paper examines the federal Violent Crime Control and Law Enforcement Act of 1994, which bans a group of military-style semiautomatic firearms (i.e., assault weapons). Using a variety of national and local data sources, we assess the short-term (1994–1996) impact of the assault weapons ban on gun markets, examining trends in prices and production of the banned weapons in legal markets and assessing the availability of the banned weapons in illicit markets as measured by criminal use. Prices of assault weapons rose substantially around the time of the ban's enactment, reducing the availability of assault weapons to criminal users in the very short run. However, a surge in assault weapon production just before the ban caused prices to fall in the months following the ban. Implications of the findings for assessing this and other gun control policies are discussed.     

Investigation of the variability in the tool marks produced by modified blank firing pistols on fired 7.65 mm projectiles

Firearms identification has an important place in forensic ballistic investigations since the weapons are widely used in criminal offences. Firearm examiners resolve many case files, through the use of automatic systems or comparison microscopes. Advanced forensic technologies like BALİSTİKA helps to record and analyze non standard ballistic evidence. In today's world, with the ease of access to materials and production technique information, pistols modified from blank firers are frequently encountered as crime tools. In this study, the characteristics of 7.65 mm fired cartridge cases obtained by controlled shots from blank firing modified pistols were examined, and their detection performances were compared by means of the Balistika system. Although distinctive differences are not expected after successive test shootings, balistically important changes were seen after the use of blank firing modified pistols and the 3D imaging system proved to be useful in observing such differences. The analyses showed that the modifications in weapons lead to variation in the ballistic characteristics and reduce the accuracy of the detection performance, which may result in flawed forensic decisions. It was also found that the deviations in ballistic impressions of modified blank firing pistols were greater than that of standard fabricated and hand-made pistols. This unique study contributed to the forensic sciences literature by focusing on the impact of modified weapons on ballistic characteristics.     

从国际法角度析空间武器问题

美国于2002年退出《弹道导弹条约》,并启动导弹防御计划,使外层空间面临着成为军备竞赛新场所的危险.尽管现有的国际法对空间武器的使用是否合法没有作明文规定,但包括《联合国宪章》等在内的国际法律性文件都试图以法律手段实现外层空间的非军事化;而根据《部分禁止核试验条约》,不允许缔约国进行任何使用核动力的导弹拦截试验;《环境影响公约》和《外空条约》等则禁止出于军事目的或任何其他敌对方式使用空间武器.     

Gun Availability and Robbery Rates: A Panel Study of Large U.S. Cities, 1974–1978

This paper examines the hypothesis that crime rates and the availability of firearms form a "vicious circle," so that increases in one lead to increases in the other. Two waves of panel data are used to estimate the relationship between rates of robbery and the relative availability of guns in a sample of large U.S. cities. The results indicate that total robbery rates and gun availability had no influence on each other, but that weapons choice in robbery and gun availability did form a mutually reinforcing cycle. Some implications of these findings are considered.     

犯罪黑数及其控制

犯罪黑数是指由于各种原因而没有记载在刑事统计中的具体犯罪数据 ,也就是刑事统计犯罪个数与实际发生的犯罪数之差。犯罪黑数存在的原因相当复杂 ,而要控制这一现象 ,也需要从其产生的社会原因、法律原因以及主体因素等方面加以考虑。