Association of Ignitable Liquid Residues to Neat Ignitable Liquids in the Presence of Matrix Interferences Using Chemometric Procedures*,†

Abstract: In fire debris analysis, weathering of ignitable liquids and matrix interferences can make the identification of ignitable liquid residues (ILRs) difficult. An objective method was developed to associate ILRs with the corresponding neat liquid with discrimination from matrix interferences using principal components analysis (PCA) and Pearson product moment correlation (PPMC) coefficients. Six ignitable liquids (gasoline, diesel, ultra pure paraffin lamp oil, adhesive remover, torch fuel, paint thinner) were spiked onto carpet, which was burned, then extracted using passive headspace extraction, and analyzed by gas chromatography‐mass spectrometry. Both light and heavy burn conditions were investigated. In the PCA scores plot, ignitable liquids were discriminated based on alkane and aromatic content. All ILRs were successfully associated with the corresponding neat liquid using both PCA and PPMC coefficients, regardless of the extent of burning. The method developed in this research may make the association of ILRs with corresponding neat liquids more objective.     

Blind lineup administration as a prophylactic against the postidentification feedback effect

Confidence and other testimony-relevant judgments may be distorted when witnesses are given confirming postidentification feedback, and double-blind procedures-wherein the lineup administrator does not know the identity of the suspect-are a commonly proposed, but untested, remedy for this effect. In the current study, mock witnesses viewed a staged crime video followed by a target-present or target-absent lineup where the administrator was or was not presumed to know the identity of the suspect. After making an identification decision, witnesses were or were not given realistic, but nonidentification-specific, feedback, and then confidence and other judgments were assessed. A significant interaction was found between blind condition and feedback such that feedback inflated confidence and other judgments in presumed nonblind conditions only; feedback had no effect on participants in presumed blind conditions. As predicted by the selective cue integration framework-a theoretical model suggested to explain the interaction between presumed blind administration and feedback-this interaction was significant only for inaccurate participants. These results suggest that blind administration may serve as a prophylactic against the negative effects of postidentification feedback. In addition, the effectiveness of our subtle feedback in influencing judgments suggests that lineup administrators should take care not to provide any feedback to eyewitnesses. (PsycINFO Database Record (c) 2012 APA, all rights reserved).     

Paying for the crimes of their children: Public support of parental responsibility

Parental responsibility laws, varying greatly within and among the states, appeared as one answer to the questions surrounding juvenile crime. Although these laws would seem to garner great public support under the new punitive attitude toward juveniles, no recent empirical studies were conducted on this topic. The current research examined public support of parental responsibility for crimes children commit. Contrary to expectations, public support was found to be relatively low. The public did place some responsibility on the parents when a juvenile crime occurred; however, agreement with blaming and punishing the parents was low. Political ideology and educational status served as possible predictors of support. Overall, however, demographic variables proved not predictive in determining who would support these measures.     

Justice,Morality, and the Dehumanization of Refugees

Three studies were conducted to test the role of the dehumanization of refugees (through claims that they are immoral) in determining emotional reactions to refugees, attitudes toward refugees, and attitudes toward current refugee policy in Canada. We also examined determinants of such perceptions. In Studies 1 and 2, correlational analyses and structural equation modeling were utilized. In both studies, it was demonstrated that individuals who are higher in social dominance orientation are especially likely to dehumanize refugees, and this dehumanization leads to greater contempt and lack of admiration for refugees, resulting in less favorable attitudes toward the group and toward the nation’s current refugee policy. Study 3 was an experiment in which we examined the effects of information presented about refugees on emotions and attitudes. Results demonstrated that dehumanizing media depictions of refugees as violating appropriate procedures and trying to cheat the system cause greater contempt and lack of admiration for refugees in general, which in turn lead to less favorable attitudes toward the group and less support for the current refugee policy. Results are discussed in terms of the functions that dehumanization may serve, and potential strategies for counteracting such effects. Preparation of this article was supported by a Social Sciences and Humanities Research Council of Canada grant to the first author. Portions of this research were presented at the 2005 EAESP Small Group Meeting on Social Justice and Intergroup Conflict, Lisbon, Portugal, and at the 2005 Meeting of the European Association of Experimental Social Psychology, Wurzburg, Germany