Linking ammonium nitrate-aluminum (AN-AL) post-blast residues to pre-blast explosive materials using isotope ratio and trace elemental analysis for source attribution

Forensic science practitioners are often called upon to attribute crimes using trace evidence, such as explosive remnants, with the ultimate goal of associating a crime with a suspect or suspects in order to prevent further attacks. The explosive charge is an attractive component for attribution in crimes involving explosives as there are limited pathways for acquisition. However, there is currently no capability to link an explosive charge to its source via post-blast trace residues using isotope ratios or trace elements. Here, we sought to determine if pre-blast attribution signatures are preserved after detonation and can be subsequently recovered and detected. A field study was conducted to recover samples of post-blast explosives from controlled detonations of ammonium nitrate-aluminum (AN-Al), which were then analyzed via isotope ratio mass spectrometry (IRMS) and inductively coupled plasma-mass spectrometry (ICP-MS) for quantitation and profiling of isotopes ratio and trace element signatures, respectively. Oxygen and nitrogen isotope ratios from AN-Al yielded some of the most promising results with considerable overlap within one standard deviation of the reference between the spreads of pre- and post-blast data. Trace element results from AN-Al support the findings in the isotope ratio data, with 26 elements detected in both pre- and post-blast samples, and several elements including B, Cd, Cr, Ni, Sn, V, and Zn showing considerable overlap. These preliminary results provide a proof-of-concept for the development of forensic examinations that can attribute signatures from post-blast debris to signatures in pre-blast explosive materials for use in future investigations.     

‘Omnus et Singulatim’: Establishing the Relationship Between Transitional Justice and Neoliberalism

First developed by human rights lawyers and activists, transitional justice emerged from the so-called third wave of democratisations in Latin America. Over the last 30 years, transitional justice has risen to become a ‘global project’ of global governance. Locating the emergence of transitional justice within the global rise of neoliberalism, this article shows that transitional justice serves an important function in regards to the particularly neoliberal contours of many transitions. Understanding this relation, the article argues, is best served with recourse to what Wendy Brown describes as neoliberalism’s practice of omnus et singulatim, a double process through which ‘communities’ are gathered together as stakeholders to take part in economic activities whilst simultaneously being individualised as ‘responsibilised’ and self-sufficient entrepreneurial units. Taking this concept, I argue that transitional justice also undertakes a process of omnus et singulatim that usefully prefigures and supports processes of neoliberalisation during ‘transition’. Transitional justice, it concludes, does the necessary work of bringing conflictual, traumatised, societies back together, whilst doing so on terms that do not threaten but instead prefigure the individualising demands made upon subjects at the sites of neoliberal transition.     

Conclusion: Time for Participatory Budgeting to Grow Up

Only a few years ago, participatory budgeting (PB) in the US was in its infancy, a tiny experiment in democracy. After a five-year growth spurt, PB has entered its awkward adolescence, full of bold achievements, flashes of potential, and some stumbles. PBNYC’s innovation has raised new questions for participatory democracy, as the contributors to this special issue highlight. In this article, I lift up the key impacts and challenges that they discuss, and their practical implications. I argue that for PBNYC and other PB processes to grow up, city leaders need to invest in equity, expand project eligibility and funding, and scale PB up to the city level.