Estimating Individual Contributions to Complex DNA SNP Mixtures.,

High‐throughput sequencing (HTS) of large panels of single nucleotide polymorphisms (SNPs) provides an alternative or complimentary approach to short tandem repeats (STRs) panels for the analysis of complex DNA mixture forensic samples. For STRs, methods to estimate individual contribution concentrations compare capillary electrophoresis peak heights, peak areas, or HTS allele read counts within a mixture. This article introduces three approaches (mean, median, and slope methods) for estimating individual DNA contributions to forensic mixtures for HTS/massively parallel sequencing (MPS) SNP panels. For SNPs, the major:minor allele ratios or counts, unique to each contributor, were compared to estimate contributor proportion within the mixture using the mean, median, and slope intercept for these alleles. The estimates for these three methods were typically within 5% of planned experimental contributions for defined mixtures.     

The CSI Effect and the impact of DNA evidence on mock jurors and jury deliberations

ABSTRACT

The present research examined the CSI Effect and the impact of DNA evidence on mock jurors and jury deliberations using a 3 (Crime Drama Viewing: low, moderate, high)?×?3 (Evidence: DNA innocent, DNA guilty, no DNA control) design. A sample of 178 jury-eligible college students read a case of breaking and entering. Pre-deliberation, some support for a CSI Effect was found with high viewers’ extent of guilt ratings significantly lower than moderate and low viewers’ in the no DNA control and the DNA innocent conditions. This effect was not present for verdicts. Contrary to a CSI Effect, crime drama viewing was not related to guilt judgments with incriminating DNA evidence. A content analysis of comments made during deliberations found little support for the CSI Effect entering the jury room. Specifically, CSI Effect predictions were not supported when examining the discussion of DNA evidence, expressing DNA opinions, or mentioning missing evidence. Overall, the limited CSI Effect found for individuals was attenuated during deliberation. The alarm raised over a possible CSI Effect influencing jury decision making may be unwarranted.     

The association between childhood sexual abuse and sexual coercion in men: a test of possible mediators

ABSTRACT

We examined the associations between childhood sexual abuse (CSA), childhood physical abuse (CPA), sexual domain variables, antisocial tendencies, and sexually coercive behaviour in a non-forensic sample of 173 heterosexual men. CSA was associated with paraphilic interests and experiences, a more extensive sexual life history, and early antisocial tendencies. CPA was associated with paraphilic interests and experiences, more self-reported delinquency, higher sensation seeking, and early antisocial tendencies. Sexual domain variables (e.g. number of sexual partners, sexual interest in sadomasochism) mediated the link between CSA and sexually coercive behaviour, but antisocial domain variables (e.g. delinquency, sensation seeking) did not. Of the two sexual domains examined, extensive sexual life history rather than paraphilias mediated the association between CSA and sexually coercive behaviour. These results suggest CSA and CPA are associated with both sexual and antisocial outcomes, and that, for some victims of CSA, having an extensive sexual life history may account for the association between CSA and sexually coercive behaviour later in life.     

Seeking or controlling the truth? An examination of courtroom questioning practices by Canadian lawyers*

ABSTRACT

The questioning practices of Canadian lawyers were examined. Courtroom examinations (N?=?91) were coded for the type of utterance, the assumed purpose of the utterance, and the length of utterance. Results showed that approximately one-fifth of all utterances were classified as productive for gathering reliable information (i.e. open-ended, probing); less than one percent of all utterances were open-ended. Direct examinations contained more closed yes/no, probing, and open-ended questions. Cross-examinations contained more leading and clarification questions, and opinions. Moreover, cross- (vs. direct) examinations contained more questions with a ‘challenging the witness’ purpose. The longest utterances were opinions, followed by multiple and forced-choice questions. The longest answers were in response to open-ended questions, followed by multiple and probing questions. Implications for the truth-seeking function of the judiciary are discussed.     

How practices do not matter

Abstract

In his most recent work, Sangiovanni has retreated from his stronger claims about practice-dependence. Instead of claiming that principles of justice must be practice-dependent, he now expresses his claim in a modal form, arguing that there are several ways in which practices may matter. While merely mapping out the logical space of possibilities seems to look like a modest ambition, the conditions for when practices do matter according to Sangiovanni’s analysis are easily met in actuality. Consequently, if he is right, the practice-dependent approach covers a significant number of political theories. Sangiovanni’s main claim is that higher-level principles with an open texture, which include most higher-level principles in political philosophy, justify a practice-dependent method in the form of a mode of application called ‘mediated deduction,’ according to which a thoroughgoing investigation is made of the nature of the target practice. Our task in this paper is to reject this claim. This is done in two steps. First, we question Sangiovanni’s distinction between instrumental application and mediated deduction, arguing that it remains unclear whether it marks out two sufficiently distinct ‘modes’ to do any theoretical work. Second, we argue that the practice-dependent method is not required even if two such modes are established.     

EU issue voting and the 2014 European Parliament elections: a dynamic perspective

EU issue voting in European Parliament elections has been shown to be highly conditional upon levels of EU politicization. The present study analyzes this conditionality over time, hypothesizing that the effect of EU attitudes on EP vote preferences is catalyzed as EP elections draw closer. In contrast to extant cross-sectional post-election studies, we use a four-wave panel study covering the six months leading up to the Dutch EP elections of 2014, differentiating between party groups (pro, anti, mixed) and five EU attitude dimensions. We find that EU issue voting occurs for both anti- and pro-EU parties, but only increases for the latter. For mixed parties we find no effect of EU attitudes, yet their support base shifts in the anti-EU direction as the elections draw closer. The overarching image, however, is one of surprising stability: EU attitudes form a consistent part of EP voting motivations even outside EP election times.