Evaluation of DNA Extraction Methods for Processing Fingerprint Powder-Coated Forensic Evidence

In unison, fingerprinting and DNA analysis have played a pivotal role in forensic investigations. Fingerprint powders that are available on the market can come in a range of colors and with specific properties. This study evaluated the efficiency of DNA extraction from samples coated with 3 brands of fingerprint powders: Lightning, Sirchie, and SupraNano, covering a range of colors and properties. A total of 23 fingerprint powders were tested using the Chelex, Promega DNA IQ™, and Applied Biosystems™ PrepFiler™ DNA extraction protocols. The DNA IQ™ and PrepFiler™ methods extracted higher yields of DNA in comparison to Chelex, which also accounted for better quality of PowerPlex x00AE; 21 DNA profiles recovered. There were no signs of degradation or inhibition in the quantification data, indicating that samples returning low DNA yield was due to interference during DNA extraction and not PCR inhibition. DNA profiles were recovered from the majority of fingerprint powders with only a single powder, Sirchie Magnetic Silver, failing to produce a profile using any of the methods tested. A link was observed between the DNA extraction chemistry, fingerprint powder property, that is, nonmagnetic, magnetic and aqueous, and the brand of fingerprint powder. Overall, the DNA IQ™ method was favorable for nonmagnetic fingerprint powders, while magnetic fingerprint powders produced more DNA profiles when extracted with the PrepFiler™ chemistry. This study highlights the importance of screening DNA extraction chemistries for the type of fingerprint powder used, as there is not a single DNA extraction method that suits all fingerprint powder brands and properties.     

Surgical Sutures as a Means of Identifying Human Remains*

Abstract: The Food and Drug Administration does not require surgical sutures to be tracked by manufacturer, physician, or patient; thereby, surgical sutures have been of little use to forensic practitioners who are tasked with establishing a positive identification with biological evidence. This study demonstrates the investigative process used to pinpoint suture manufacturers by presenting a case where surgical sutures were a distinctive characteristic that aided in the positive identification of skeletal remains. The suture’s manufacturer, construction material and structure, size, and medical use was determined by contacting a local surgical suture and orthopedic implant manufacturer and utilizing publicly available manufacturer websites, which provide catalogs and specific product details. This research was one of many lines of evidence used to establish the positive identification of a 47‐year‐old male.     

Does neighborhood watch reduce crime? A systematic review and meta-analysis

Neighborhood watch grew out of a movement in the USA during the late 1960s that promoted greater involvement of citizens in the prevention of crime. Recent estimates suggest that over a quarter of the UK population and over 40% of the US population live in areas covered by neighborhood watch schemes. The current paper presents the results of a recent systematic review of evaluations of neighborhood watch. The main findings of the narrative review were that about half of the schemes evaluated showed that neighborhood watch was effective in reducing crime, with most of the other evaluations having uncertain effects. The main findings of the meta-analysis were that 15 of the 18 studies provided evidence that neighborhood watch reduced crime. While the results of the review are encouraging, it was concluded that more high-quality research needs to be done to help explain why study variations exist.

The portrayal of Africans in agricultural films of Southern Rhodesia (Zimbabwe): 1940s to 1950s

Abstract

One of the most effective cultural tools used by the colonial governments in Africa to make their rule acceptable to African indigenous populations was film. In Rhodesia (now known as Zimbabwe) the colonial government created the Central Film Unit whose major aim was to teach Africans new agricultural methods. The response by Africans to this colonial initiative was mixed. Some welcomed and enjoyed the films and made use of the skills that the films popularised, but others were cynical and viewed these films as a tool to consolidate British white settler rule in Rhodesia. This article analyses six colonial films produced in the 1940s and 1950s. The article argues that through the use of colonial films, the Rhodesia government was able to persuade African communal farmers to adopt modern methods of farming. The irony of this is that the use of modern farming methods made it possible for the same colonial authorities to later blame Africans for the ecological disaster in the communal areas.     

Workforce Localization among Chinese State-Owned Enterprises (SOEs) in Ghana

Chinese state-owned enterprises (SOEs) have gradually localized their workforce since they began operating in Ghana in the 1980s. Examining their workforce localization patterns, the Chinese SOEs in Ghana appear to be diverse in their business practices and highly autonomous from the Chinese state. Our hypothesis on the substantial autonomy of Chinese SOE overseas subsidiaries, which is consequent to the lack of management control from the Chinese central authority since the Chinese economic reform, contrasts the dominant assumption in the China–Africa debate, in which Chinese SOEs are depicted as closely linked to the Chinese state and/or as the arms of the new Chinese policy in Africa. The workforce localization process of Chinese SOEs in Ghana is largely determined by factors like profit maximization objective, market competition and political pressure. The localization experience is similar to those of Western companies in Africa where complete workforce localization takes a long time to achieve.     

Representation through Participation: A Multilevel Analysis of Jury Deliberations

Fully participatory jury deliberations figure prominently in the idealized view of the American jury system, where balanced participation among diverse jurors leads to more accurate fact‐finding and instills public confidence in the legal system. However, research more than 50 years ago indicated that jury‐room interactions are shaped by social status, with upper‐class men participating more than their lower‐class and female counterparts. The effects of social status on juror participation have been examined only sporadically since then, and rarely with actual jurors. We utilize data from 2,189 criminal jurors serving on 302 juries in four jurisdictions to consider whether—and in what conditions—participation in jury deliberations differs across social groups. Our results indicate the continuing importance of social status in structuring jury‐room interactions, but also reveal some surprising patterns with respect to race and gender that depart from earlier research. We also find that contextual factors including location, case characteristics, and faction size shape the relationship between social status and participation. We conclude with a critical discussion of our results and urge other researchers to take into account contextual factors when examining how individual juror characteristics shape what happens inside the jury room.