A forensic international market survey of condom lubricants and personal hygiene products using ATR-FTIR coupled to chemometrics

Condom residues may be encountered in forensic investigations as traces in sexual assault or rape cases. Casework studies have shown the value of distinguishing condom residues from other types of personal products used by women. However, up to now, there has been no investigation of their chemical variability within an international context. This work employed attenuated total reflectance Fourier transform infrared spectroscopy with chemometrics to provide objective characterisation of condom lubricants and personal hygiene products from the international market. 166 samples were obtained covering five major classes of products likely to be used by women. Principal component analysis distinguished most major classes based on their spectral profiles, with subsequent support vector machine models yielding discrimination accuracies over 90%. A two-step approach was subsequently developed and enabled both classification and a discrimination accuracy of 100%. This could provide greater confidence in chemical discrimination of residues from these products when conducting investigations and help assess the origin of the chemical profile obtained. Further testing using three validation sets produced an identification accuracy of 100% for generic classes, which may allow investigative leads to be more readily obtained from recovered evidence.     

Forensic Discrimination of Dyed Hair Color: I. UV‐Visible Microspectrophotometry*†

Abstract: Current protocols for examining hair do not attempt to differentiate hair color using instrumental analysis. In this study, hair samples treated with 55 different red hair dyes were analyzed using UV‐visible microspectrophotometry between 200 and 700 nm. Using air as a background reference gave the best results, although mounting media such as glycerin could also be used. The contribution of the hair substrate is predominantly observed in the range of 300–400 nm while the dye peak is evident in the range of 425–550 nm. It was found that the presence of hair dye reduces the overall intrasample variability of the hair color. In addition, visual inspection and spectral interpretation showed that dyed hair exhibits distinct and discernable shades. The color of all samples was stable during storage and while all hair dyes fade with washing, significant fading of the color was only evident after daily washing for 3 weeks.     

Heroic Action and Its Discontents: Safe Horizon’s Response to 9/11

Based on first-hand qualitative research, this article describes and analyzes the significant role that a local, New York City-based social service agency played in responding to 9/11; the sources of its notable ability to provide assistance to individuals and families affected by this terrorist attack; and the structural strains and unanticipated divisions within the agency that the heroism of its fervid engagement nevertheless engendered.

Counter-conduct and its Intra-modern Limits

ABSTRACT

This article critically explores the Foucauldian concept of “counter-conduct”, which has recently been applied to the study of resistance in international relations (IR). Whilst a counter-conduct analytic can destabilise a power/resistance binary, I argue in this article that it does not fully overcome onto-political assumption. Drawing on postcolonial and decolonial perspectives, alongside discussions with protesters during the 2014 “Umbrella Movement” protests in Hong Kong, this article traces how a counter-conduct analytic can fix and flatten the politics and ethics of struggle in other ways. Specifically, I draw out three limiting assumptions about power/resistance articulated by Foucault, which are then implicated in a counter-conduct analytic: (1) his intra-modern critique of power; (2) his undivided reading of the subject; and (3) his valorisation of the politics of struggle. Offering a constructive critique, this article considers the stakes of unsettling these intra-modern limits and the consequences for an emerging counter-conduct research agenda.