Optimizing Ballistic Imaging Operations

Ballistic imaging systems can help solve crimes by comparing images of cartridge cases, which are recovered from a crime scene or test‐fired from a gun, to a database of images obtained from past crime scenes. Many U.S. municipalities lack the resources to process all of their cartridge cases. Using data from Stockton, CA, we analyze two problems: how to allocate limited capacity to maximize the number of cartridge cases that generate at least one hit, and how to prioritize the cartridge cases that are processed to maximize the usefulness (i.e., obtained before the corresponding criminal case is closed) of hits. The number of hits can be significantly increased by prioritizing crime scene evidence over test‐fires, and by ranking calibers by their hit probability and processing only the higher ranking calibers. We also estimate that last‐come first‐served increases the proportion of hits that are useful by only 0.05 relative to first‐come first‐served.     

Criminal DNA databases: the European situation

In the last 5 years, a number of European countries have successfully introduced national databases holding the DNA profiles from suspected and convicted criminal offenders as well as from biological stain materials from unsolved crime cases. At present, DNA databases are fully or partially in operation in the UK, The Netherlands, Austria, Germany, Finland, Norway, Denmark, Switzerland and Sweden. Furthermore, in the other European countries, specific legislation will be enacted soon, or the introduction of such databases is being discussed to initiate a legislative process. Numerous differences exist regarding the criteria for a criminal offender to be included in the database, the storage periods and the possibility to remove database records, the possibility to keep reference samples from the offenders as long as their respective records are being held, and the role of judges in the process of entering a database record or to perform a database search. Nevertheless, harmonization has been achieved regarding the DNA information stored in national databases, and a European standard set of genetic systems has been recommended which is included either in part or completely in the DNA profiles of offenders and crime stains for all European databases. This facilitates the exchange of information from database records to allow the investigation of crime cases across national borders.     

Linking crime guns: the impact of ballistics imaging technology on the productivity of the Boston Police Department's Ballistics Unit

Ballistics imaging technology has received national attention as a potent tool for moving the law enforcement response to violent gun criminals forward by linking multiple crime scenes to one firearm. This study examines the impact of ballistics imaging technology on the productivity of the Boston Police Department's Ballistics Unit. Using negative binomial regression models to analyze times series data on ballistics matches, we find that ballistics imaging technology was associated with a more than sixfold increase in the monthly number of ballistics matches made by the Boston Police Department's Ballistics Unit. Cost-effectiveness estimates and qualitative evidence also suggest that ballistics imaging technology allows law enforcement agencies to make hits that would not have been possible using traditional ballistics methods.     

DNA identification of skeletal remains by investigator’s intuition

In June 2006 a decapitated woman was found in a parking area of the motorway in the area of Prato (Florence). Since the body was beheaded and no victim’s documents or objects were present at the crime scene, identification at that time was impossible. However, DNA profile from woman’s bones were collected. In the same year (2003), a mother had reported her daughter's disappearance but the two events were not related at that time. About ten years later the mother’s DNA profile was finally acquired for a genetic identification of another girl’s body found in the Ferrara area. These genetic profiles were completely discordant. All these genetic comparisons were carried out on behalf of the prosecutors of the cities involved in the findings of the bodies and in the disappearance complaints, but due to the lack of a database the events remained disconnected. In January 2017, the head of the scientific police of Prato who had followed the investigation and questioned the mother of the missing girl found about ten years later, suggested to the magistrate to order the comparison of the mother's DNA with the genetic profile of the bones found in 2006. This comparison finally allowed the identification of the missing daughter.This story highlights the importance of having forensic DNA database to search for missing persons and how the investigator's intuition can play a key role in resolving criminal cases. In fact, databases of unknown bodies and relatives of missing persons were created in Italy as a part of national DNA database just at the beginning of 2018.     

Investigating the Reliability of the Violent Crime Linkage Analysis System (ViCLAS) Crime Report

The Violent Crime Linkage Analysis System (ViCLAS) is a computerized investigative aid, developed by the Royal Canadian Mounted Police, which is used to increase information sharing and enable crime linkages in serious crime investigations. The current study examines the reliability of the ViCLAS Crime Report by calculating the level of agreement among two samples of police officers who received one of two fictitious crime scenarios; homicide (n = 116) or sexual assault (n = 121). Results from this study show that the observed inter-rater reliability among police officers completing the ViCLAS booklet was 79.30% for the homicide scenario, and 87.70% for the sexual assault scenario. Implications of the results are discussed.     

香港特别行政区的DNA数据库

香港特区的DNA数据库成立于2001年,法例上此数据库直属于香港警务处长,由香港政府化验师代行管理及维护。被定罪人士其罪行最高刑期为监禁7年或以上及任何罪案之疑犯均可被套取其口腔拭子样本,利用美国App lied B iosystem s的试剂进行DNA分型测试。所确立之DNA图谱将上载到由美国FB I(联邦调查局)在2000年免费为香港政府化验所提供的,名为COD IS(Comb ined DNA Index System)的计算机系统;在罪案现场所收集到的不明来历的DNA数据样本亦会被上载到COD IS。被定罪人士及疑犯的DNA图谱会定期与罪案现场的DNA数据在CO-D IS内进行较对以便协助警方调查。本文介绍香港DNA数据库的操作,其中包括统计数据的讨论。     

Reference ballistic imaging database performance

Ballistic imaging databases allow law enforcement to link recovered cartridge cases to other crime scenes and to firearms. The success of these databases has led many to propose that all firearms in circulation be entered into a reference ballistic image database (RBID). To assess the performance of an RBID, we fired 4200 cartridge cases from 600 9 mm Para Sig Sauer model P226 series pistols. Each pistol fired two Remington cartridges, one of which was imaged in the RBID, and five additional cartridges, consisting of Federal, Speer, Winchester, Wolf, and CCI brands. Randomly selected samples from the second series of Remington cartridge cases and from the five additional brands were then correlated against the RBID. Of the 32 cartridges of the same make correlated against the RBID, 72% ranked in the top 10 positions. Likewise, of the 160 cartridges of the five different brands correlated against the database, 21% ranked in the top 10 positions. Generally, the ranking position increased as the size of the RBID increased. We obtained similar results when we expanded the RBID to include firearms with the same class characteristics for breech face marks, firing pin impressions, and extractor marks. The results of our six queries against the RBID indicate that a reference ballistics image database of new guns is currently fraught with too many difficulties to be an effective and efficient law enforcement tool.     

Aoristic Signatures and the Spatio-Temporal Analysis of High Volume Crime Patterns

The spatial analysis of crime and the current focus on hotspots has pushed the area of crime mapping to the fore, especially in regard to high volume offenses such as vehicle theft and burglary. Hotspots also have a temporal component, yet police recorded crime databases rarely record the actual time of offense as this is seldom known. Police crime data tends, more often than not, to reflect the routine activities of the victims rather than the offense patterns of the offenders. This paper demonstrates a technique that uses police START and END crime times to generate a crime occurrence probability at any given time that can be mapped or visualized graphically. A study in the eastern suburbs of Sydney, Australia, demonstrates that crime hotspots with a geographical proximity can have distinctly different temporal patterns.     

Attitudes towards police use of consumer/private DNA databases in investigations

Consumer DNA products, such as databases that allow the public to explore familial relationships, have recently been used by police to assist in investigations. This has moved the collection of DNA used in criminal investigations away from the limitations of criminal databases and has opened up ethical concerns regarding privacy and consent. This study explored public attitudes and support towards police use of consumer DNA databases in investigations to assess whether different crime types or moral and attitude alignments influenced the level of public support of police using these consumer products. An international survey of 438 adults, using theory and scales pertaining specifically to retributive punishment and attitudes towards law, courts and police, found that moral alignment and attitudes did influence the level of public acceptability towards police usage of these techniques and that support did vary based on crime type. This research found that higher levels of public support was given for the most serious case types explored (sexual assault and homicide). Participant support for police access to private DNA databases by case type was as follows; 83.5% for sexual assault, 83.2% for homicide, 85.2% for identifying unidentified human remains, 62.8% for robbery and 58.9% for illicit drug related cases. Small to medium effects sizes were observed for these results. Although these findings provided context towards public attitudes, further research specific to international attitude differences and variance between serious crime types and public acceptability could further develop these findings.     

Reference ballistic imaging database performance

Ballistic imaging databases allow law enforcement to link recovered cartridge cases to other crime scenes and to firearms. The success of these databases has led many to propose that all firearms in circulation be entered into a reference ballistic image database (RBID). To assess the performance of an RBID, we fired 4200 cartridge cases from 600 9mm Para Sig Sauer model P226 series pistols. Each pistol fired two Remington cartridges, one of which was imaged in the RBID, and five additional cartridges, consisting of Federal, Speer, Winchester, Wolf, and CCI brands. Randomly selected samples from the second series of Remington cartridge cases and from the five additional brands were then correlated against the RBID. Of the 32 cartridges of the same make correlated against the RBID, 72% ranked in the top 10 positions. Likewise, of the 160 cartridges of the five different brands correlated against the database, 21% ranked in the top 10 positions. Generally, the ranking position increased as the size of the RBID increased. We obtained similar results when we expanded the RBID to include firearms with the same class characteristics for breech face marks, firing pin impressions, and extractor marks. The results of our six queries against the RBID indicate that a reference ballistics image database of new guns is currently fraught with too many difficulties to be an effective and efficient law enforcement tool.     

ECJ provides further guidance on the ambit of database right

Following on from the European Court of Justice's ruling on database right in the Directmedia case, the Court has looked in more detail at the protection afforded by database right, and provided further clarification of the meaning of ‘extraction’ and ‘substantial’, particularly in relation to modular databases comprised of several sections. The ECJ's ruling is positive for database owners for the most part, bolstering its previous broad interpretation of the acts of ‘extraction’ that can infringe and considering in more detail other points touched on in the Directmedia, British Horseracing Board and Fixtures Marketing cases. This article discusses the outcome and implications of the ruling.     

Journey to murder: examining the correlates of criminal mobility in sexual homicide

Although the empirical research on the journey to crime seems to indicate that most crimes are committed close to home, only a few studies have specifically examined the journey to crime in cases of sexual homicide. Using a sample of 214 sexual homicide cases, the current study investigates, using logistic regression, offenders who travel during the crime to those offenders who commit their crime, all at the same location. Current findings suggest that sexual murderers who engage in intra-crime travel tend to use a vehicle in the commission of their offence, target adult victims who are involved in the sex trade and move the body post murder.     

Analyzing Approaches to the Backlog of Untested Sexual Assault Kits in the U.S.A.

Motivated by the debate over how to deal with the huge backlog of untested sexual assault kits in the U.S.A., we construct and analyze a mathematical model that predicts the expected number of hits (i.e., a new DNA profile matches a DNA sample in the criminal database) as a function of both the proportion of the backlog that is tested and whether the victim–offender relationship is used to prioritize the kits that are tested. Refining the results in Ref. (Criminol Public Policy, 2016, 15, 555), we use data from Detroit, where government funding was used to process ≈15% of their backlog, to predict that prioritizing stranger kits over nonstranger kits leads to only a small improvement in performance (a 0.034 increase in the normalized area under the curve of the hits vs. proportion of backlog tested curve). Two rough but conservative cost‐benefit analyses—one for testing the entire backlog and a marginal one for testing kits from nonstranger assaults—suggest that testing all sexual assault kits in the backlog is quite cost‐effective: for example, spending ≈$1641 to test a kit averts sexual assaults costing ≈$133,484 on average.     

刑法中的客观归责理论

客观归责理论是目前德国刑法学界研究的时尚理论.根据该理论,如果行为制造了危及行为客体而为法所不容许的风险,并且这个风险实现了构成要件的结果,那么这种由人的行为所导致的结果是可归责的.客观归责理论是一个正处于发展之中的理论,其所开创的新的诠释方法对犯罪理论具有积极意义,但其本身也存在着一些难以克服的问题.研究这一理论,对我国刑法理论的研究具有重要的启示意义.     

The sexual stratification hypothesis revisited: Testing assumptions about simple versus aggravated rape

Previous research testing the sexual stratification hypothesis has included only African American and White victims and suspects. This study also included Hispanic victims and suspects. Using data on all sexual assaults reported to the San Diego Police from 1995 to 2002, the analysis focused on the effects of the racial/ethnic composition of the victim/offender dyad, the relationship between victim and offender, and type of rape on three sexual assault case outcomes: whether the victim declined prosecution, whether the police unfounded the crime, and whether the district attorney filed charges. A secondary analysis employed the liberation hypothesis to test whether the effect of race was confined to simple rape. Results indicated that the racial composition of the victim/offender dyad was largely insignificant in determining case outcomes, but that the relationship between victim and offender and whether the suspect and victim were under the influence of alcohol or drugs had strong effects.     

The Punitive Repertoire of Children's Homes and Reformatories

Although equality before the law is one of the fundamental principles of modern democracy, current Western research has shown that discrimination exists within the justice system when enforcing traditional crimes. However, in Scandinavian research on economic crime, the question of equal treatment has been neglected. Based on Swedish data of suspected offenders during 2003, we examined whether different social groups received differential treatment in investigations of traditional and economic crimes. Further, we compared the Regular Police with the Economic Crimes Bureau (ECB) to examine whether the professional specialization of street-level bureaucrats influence the occurrence of differential treatment. We also examined the efficiency of the authorities and more specifically to what extent they issue a waiver of prosecution, a prosecutor's fine, or a court indictment. Besides supporting earlier research on traditional crime, our results show that differential treatment also exists in relation to economic crime, but the patterns of differential treatment are not identical with the ones for traditional crimes. We also found that the two agencies, the ECB and the Regular Police, treat diverse social groups differently. Although the ECB is somewhat more efficient, professional specialization does not appear to be an important factor concerning the issue of differential treatment. It exists regardless of investigating authority. Further action is being taken more often in relation to men and those with a lower level of education at both agencies. However, in some cases the suspect's background does have a different effect on the work of the two agencies, with the ECB less often taking further action against ‘Swedes’ and those on ‘high incomes’, while the Regular Police less often take further action against ‘immigrants’ and those on ‘low and middle incomes’.     

Risks of Criminal Victimization in Contemporary Urban China: An Application of Lifestyle/Routine Activities Theory

The philosophical underpinnings of youth courts rest on the notion that youths are less culpable and more reformable than adults. Some scholars argue that, ideally, when sentencing youth crime, judges should engage youthful offenders in moral communication to elicit change. But do they? What more generally do judges say to the youths? This paper analyzes the frequency and content of judicial censure and moral communication in the sentencing of youth sex offenders. Drawing on the sentencing remarks for 55 sexual violence cases, we examine the ways in which judges interact with youths and censure the offenses, and what, if any, normative guidance they give concerning gender, sexuality, and violence. We found that in most but not all cases, the judges censured the offending as both a moral and legal wrong. However, they spent more time discussing a youth’s future than past behavior, as they sought to elicit change. The judges did not degrade or exclude the offenders; rather, they addressed them in a spirit of reintegration, as worthy individuals with future potential. Although the judges set norms of appropriate sexual behavior to the youths when the offense victims were children, they did not always do so when victims were female peers. In this Youth Court, “real rape” was sexual offending by a youth against a child under 12 years of age. By contrast, in about one‐fifth of cases, all of which occurred against a female peer, the offending was censured only as a legal wrong (a “pseudo censure”) and less likely subject to judicial norm setting.     

Frequency of serial sexual homicide victimization in Virginia for a ten-year period

The frequency of serial sexual murder has been widely discussed, and estimates of the number of victims in the United States range from 500 to 6000 per year. This study attempted to quantify the number of serial sexual murder victims in Virginia for a ten-year period. Multiple sources of data were utilized, including Federal Bureau of Investigation (FBI) case files, FBI's Violent Criminal Apprehension Program (ViCAP) reports, Virginia State Police ViCAP reports, Virginia Homicide Investigators Association, and the Virginia Division of Forensic Science DNA database, to effectively cull out all the known serial sexual murder victims for the given time period. Review of these records revealed a total of 28 victims of serial sexual murder, compared with a total of 5183 murder victims for the same ten-year period. The frequency of serial sexual victimization was 0.5% of all homicides for the given period. These results highlight the unusual frequency of serial sexual murder.     

Homicide by ligature strangulation in Finland: offence and offender characteristics

In Finland, homicide by ligature strangulation is a rare event. The purpose of this study was to investigate recent homicide cases by ligature strangulation and to analyse offence and offender characteristics. All forensic psychiatric evaluation statements of offenders accused of ligature strangulation homicides during the 7-year period 1996--2002 (n=19) were reviewed retrospectively. Thirty-five percent of the victims were females. In four cases, the victim was the offender's intimate partner; in one case, it was the stepson; in one case, a father and in the rest of the cases (n=13), an acquaintance. None of the cases involved planning, sadism or sexual elements. In 89% of the cases, the offender was either intoxicated or on drugs at the time of the offence and in 94% of the cases, the victim was found at the scene of the killing. Of the offenders, 63% had crime history, and approximately half of the offenders had experienced parental alcohol abuse, domestic violence or previous trauma. Most of the offenders were unemployed at the time of the offence. In all, 89% were diagnosed as having personality disorder and two were schizophrenic.