The killer outfit and timing: Impact of the fabric and time in body fluid identification and DNA profiling

The present work aimed to study the detection, through lateral flow immunochromatographic (LFI) tests, of saliva samples over time in three different types of fabrics, as well as, the possibility of DNA isolation and characterization from the sample tubes and the cassettes. Fifty microliters of saliva (three samples/time) were deposited in denim, cotton, and polyester. Saliva was identified by SERATEC® Amylase Test and the Crime Scene version SALIVA CS, being able to detect it up to six months of deposition, although with different band intensities. Polyester showed stronger bands than cotton, probably due to its synthetic nature, and denim, as an inked fabric, showed less band intensities. Statistical analyses confirmed significant differences among fabrics, but not over time in the same type of fabric. Total DNA from the sample tubes was successfully recovered, in contrast, from the cassettes, only polyester retrieved amplifiable DNA. These findings indicated that it is possible to recover and identify saliva up to six months after deposition, also obtaining DNA. Future research will be able to expand these results, analyzing the stability of other body fluids, and the sensitivity of lateral flow immunochromatographic tests to detect them.     

Chemical composition and structure of the microcrystals formed between silver(I) and gamma-hydroxybutyric acid and gamma-hydroxyvaleric acid

This study examined microcrystals formed by silver with gamma-hydroxybutyric acid (GHB) and gamma-hydroxyvaleric acid (GHV), the five-carbon analog of GHB, in the presence of silver, copper, and lanthanide nitrates. Distinct microcrystals formed with silver (+1) and lanthanum (+3) ions but not with the copper (+2) ions. The crystals formed with GHB were distinctly different than those formed with GHV and in all cases, the drug microcrystals were easily distinguishable from reagent crystals. X-ray diffraction analysis provided definitive structure for the microcrystals. The morphological differences between the silver-GHB and silver-GHV crystals were characterized using simple measurements such as size and angles provided by image recognition software. The utility of the test for casework was demonstrated using spiked beverage samples.     

The Court of Public Opinion: Lay Perceptions of Polygraph Testing

We sampled a total of 411 participants and randomly assigned them one of three brief trial vignettes that contained either no-polygraph evidence, evidence of a passed polygraph test, or evidence of a failed polygraph test. Participants rendered guilt judgments and answered a series of questions concerning the trial in particular, and polygraph tests in general. Similar to previous studies on the impact of polygraph evidence on jurors' guilt judgments, this sample of jury-eligible adults indicated that they did not find polygraph test evidence to be persuasive. Moreover, it mattered little to participants whether the results indicated the defendant passed a polygraph test, or that he failed a polygraph test. However, when our findings are compared to those of previous surveys involving experts in the field of psychophysiology, they differ in a number of important respects. The implications for decisions regarding admissibility (e.g., U.S. v. Alexander, 1975 and U.S. v. Scheffer, 1998) are discussed.     

Forensic science does not start in the lab: the concept of diagnostic field tests

An attempt to improve an analytical system can focus either on the actual processing or on the input. In forensic science, much emphasis has been placed on improving laboratory procedures, as though the input is already the best that can be obtained. Means of improving the basic input have gained much less attention. Yet, it must be agreed that even the best laboratory cannot gain from an item more than has been contained in it when it arrived from the field. The detection of latent materials at the crime scene by physical or chemical techniques and the diagnostic examination of material already discovered belong to the concept of diagnostic field tests. This group also includes "mapping" for the presence of certain materials, such as latent fingerprints through the distribution of amino acids on the surface. These tests are conducted outside the laboratory, without sophisticated instrumentation, at the crime scene, the suspect's home, or elsewhere. A significant advantage of the use of diagnostic field tests is the ability to deal with "dissipating evidence" such as gunshot residue or explosive traces on the hands of suspects. If time is lost, there is a risk of losing such evidence, which is liable to deteriorate rapidly. In my presentation, I will discuss older and some newly developed forensic field tests, with specific emphasis on the Israeli experience.     

Evaluation of six presumptive tests for blood, their specificity, sensitivity, and effect on high molecular-weight DNA

Luminol, leuchomalachite green, phenolphthalein, Hemastix, Hemident, and Bluestar are all used as presumptive tests for blood. In this study, the tests were subjected to dilute blood (from 1:10,000 to 1:10,000,000), many common household substance, and chemicals. Samples were tested for DNA to determine whether the presumptive tests damaged or destroyed DNA. The DNA loci tested were D2S1338 and D19S433. Leuchomalachite green had a sensitivity of 1:10,000, while the remaining tests were able to detect blood to a dilution of 1:100,000. Substances tested include saliva, semen, potato, tomato, tomato sauce, tomato sauce with meat, red onion, red kidney bean, horseradish, 0.1 M ascorbic acid, 5% bleach, 10% cupric sulfate, 10% ferric sulfate, and 10% nickel chloride. Of all the substances tested, not one of the household items reacted with every test; however, the chemicals did. DNA was recovered and amplified from luminol, phenolphthalein, Hemastix, and Bluestar, but not from leuchomalachite green or Hemident.     

求置换因子循环矩阵的逆阵及广义逆阵的快速傅氏变换法

借助快速傅立叶变换（FFT）,给出一种求n阶置换因子循环矩阵的逆阵、自反g-逆、群逆、Moore-Penrose 逆的快速算法,该算法的计算复杂性为O（nlog2n）,最后给出的两个数值算例表明了该算法的有效性。     

Visualizing Homicide: A Research Note

This paper provides some examples of the utility of graphical methods in analyzing data. While such methods are not expected to supplant standard statistical techniques, they can help the researcher in understanding characteristics of the process in ways that cannot be replicated using the standard methods.     

Asylum seekers,citizenship and reality TV in the Netherlands: quizzing refugees in jeopardy

This article interrogates a Dutch jeopardy style TV show, Weg van Nederland, featuring young, well-educated asylum seekers about to be deported. The TV program, devised in collaboration with the advocacy group ‘Defense for Children,’ performed the paradoxes resulting from the ‘inclusive exclusion’ of asylum seekers. Yet, its strategy of inscribing the contestants into the space of citizenship by highlighting their ‘rootedness’ through the quiz format also lent support to the exclusivist, essentialist understanding of national belonging that is produced in contemporary Dutch citizenship and integration law. Moreover, the show's focus on successful, thoroughly integrated and career driven young adults, while pragmatic from the perspective of the show's (limited) political objectives, also reproduced the preferred template of neoliberal citizenship, which drives the European migration regime and its policy of selective in/exclusion. These contradictions expose the possibilities, as well as the limitations, of humanitarian appeals working within the contemporary media regime, including reality TV, which imposes its own generic terms (and ideological inflections) on the justice claims launched within its public arena.     

Required to assimilate? The content of citizenship tests in five countries

In order to investigate questions about the assimilatory or liberal nature of obligatory integration measures for immigrants in Europe, this article systematically analyses and compares the content of citizenship tests in Austria, the UK, Germany, the Netherlands and the USA. Based on a two-dimensional classification of citizenship test questions – along 14 thematic and two normative categories – the analysis has produced a surprising result: no hypothesis from the existing citizenship and civic integration literature can explain the content of all five citizenship tests. Furthermore, I find that the characteristics of a citizenship policy regime are not a good predictor for the content of the respective citizenship tests. In the sample, countries renowned for having an ethno-cultural understanding of citizenship implemented citizenship tests conveying a politically liberal idea of a community of citizens, united around legal and political norms, rather than around sociocultural ones. By contrast, the Netherlands – a country with a liberal and multicultural reputation – also requires immigrants to be aware of and accept certain sociocultural norms.