A mixed DNA profile controversy revisited

Semaan et al. (J Forensic Res, 2020, 11, 453) discuss a mock case “where eight different individuals [P₁ through P₈] could not be excluded in a mixed DNA analysis. Even though … expert DNA mixture analysis software was used.” Two of these are the true donors. The LRs reported are incorrect due to the incorrect entry of propositions into LRmix Studio. This forced the software to account for most of the alleles as drop-in, resulting in LRs 60–70 orders of magnitude larger than expected. P₁, P₂, P₄, P₅, and P₈ can be manually excluded using peak heights. This has relevance when using LRmix which does not use peak heights. We extend the work using the same two reference genotypes who were the true contributors as Semaan et al. (J Forensic Res, 2020, 11, 453). We simulate three two-donor mixtures with peak heights using these two genotypes and analyze using STRmix?. For the simulated 1:1 mixture, one of the non-donors’ LRs supported him being a contributor when no conditioning was used. When considered in combination with any other potential donors (i.e., with conditioning), this non-donor was correctly eliminated. For the 3:1 mixture, all results correctly supported that the non-donors were not contributors. The low-template 4:1 mixture LRs with no conditioning showed support for all eight profiles as donors. However, the results from pair-wise conditioning showed that only the two ground truth donors had LRs supporting that they were contributors to the mixture. We recommend the use of peak heights and conditioning profiles, as this allows better sensitivity and specificity even when the persons share many alleles.     

Putting Local Associations Into their Context. Preliminary Results from a Swiss Study of Local Associations

The paper presents results from the Swiss case of the European comparative project CID (Citizenship, Involvement, Democracy). This project examines the relationship between political institutional assets and civic and political engagement in several Western and Eastern European countries. The paper seeks to investigate how civic engagement can be generated and shaped by a given institutional and political context as well as by a peculiar community size. The central hypothesis is that the context affects the character of local participation. To verify this, the papers examines two different Swiss cantons: the German speaking Canton of Bern and the French speaking Canton of Vaud. Moreover, for each canton, four local communities of different size have been selected. This research design discusses how participation is fostered by a more open political opportunity structure (the German canton), and how this combines with the size of the community.     

Letter to the editor: Commentary on “Strategic choice in linear sequential unmasking,Roger Koppl,Science & Justice,https://doi.org/10.1016/j.scijus.2018.10.010”

This letter to the Editor comments on the paper ‘Strategic choice in linear sequential unmasking’ by Roger Koppl (Science & Justice, https://doi.org/10.1016/j.scijus.2018.10.010).     

Allele frequencies of nine STR loci—D16S539, D7S820, D13S317, CSF1PO, TPOX, TH01, F13A01, FESFPS and vWA—in the population from Alagoas, northeastern Brazil

The polymorphism of nine STR loci has been studied in a sample of 598 individuals from the population of Alagoas, Northeastern Brazil. Determination of the allele frequencies as well as of several commonly used statistics in forensic and paternity testing were defined. The most polymorphic loci were TH01 and D7S317. The exact test demonstrated that the nine loci analyzed in the population have no deviation from Hardy–Weinberg equilibrium (P>0.05).     

Parliamentary Voting Procedures in Comparison

Increasingly, scholars of legislative politics propose comparative analyses of parliamentary voting behaviour across different countries and parliaments. Yet parliamentary voting procedures differ dramatically across parliamentary chambers and ignoring these differences may, in the extreme, lead to meaningless comparisons. This paper presents a first glimpse at a comprehensive data collection effort covering more than 250 parliamentary chambers in 176 countries. Focusing on European legislatures it assesses what explains the differences in the rules among chambers. It is found that incentives linked to MPs’ visibility contribute to explain the transparency of the adopted voting procedures.