Operator systems from discrete groups

We express various sets of quantum correlations studied in the theoretical physics literature in terms of different tensor products of operator systems of discrete groups. We thus recover earlier results of Tsirelson and formulate a new approach for the study of quantum correlations. To do this we formulate a general framework for the study of operator systems arising from discrete groups. We study in detail the operator system of the free group Fn on n generators, as well as the operator systems of the free products of finitely many copies of the two-element group Z2. We examine various tensor products of group operator systems, including the minimal, the maximal, and the commuting tensor products. We introduce a new tensor product in the category of operator systems and formulate necessary and sufficient conditions for its equality to the commuting tensor product in the case of group operator systems.

Elaborating Justice for Victims at the International Criminal Court: Beyond Rhetoric and the Hague

Justice for victims has often been invoked as the raison d’être of international criminal justice, by punishing perpetrators of international crimes. This article attempts to provide a more holistic account of justice for victims by examining victims’ needs, interests, and rights. The International Criminal Court itself includes participation, protection and reparation for victims, indicating they are important stakeholders. This article also suggests that victims are integral to the purpose of the ICC in ending impunity by ensuring transparency of proceedings. However, there are limits to the resources and capacity of the ICC, which can only investigate and prosecute selected crimes. To overcome this justice gap, this article directs the debate towards a victim-orientated agenda to complementarity, where state parties and the Assembly of State Parties should play a greater role in implementing justice for victims domestically. This victim-orientated complementarity approach can be achieved through new ASP guidelines on complementarity, expanding universal jurisdiction, or seeking enforcement and cooperation through regional and international bodies and courts, such asUniversal Periodic Review or the African Court’s International Criminal Law Section. In the end, ifwe are serious about delivering justice for victims we need to move beyond the rhetoric, with realistic expectations of what the ICC can achieve, and concentrate our attention to what states should bedoing to end impunity.

Meaningful and Effective? Considering Victims’ Interests Through Participation at the International Criminal Court

This article explores the role of victims in the criminal proceedings of the International Criminal Court and the extent to which their interests have impacted upon the ICC judges’ decision making in light of human rights law and victimological theorisation. The article begins by first outlining how victims’ interests can be considered in international criminal proceedings, before contrasting this role with the purpose of international criminal justice. The second part of the article examines victim participation within the ICC and how this has affected judicial decision making to assess its effectiveness. The contest between the rights of victims and the role of Prosecutor in determining the selection of charges and perpetrators is also examined in an effort to add to the current debate on victim participation at the ICC. The author finds that at the ICC, despite innovative victim provisions, victims’ interests have little impact on outcomes of the Court. The author argues that in order to ensure the Court is more responsive to victims understanding of justice it should give greater weight to their interests, which in turn is likely to improve their satisfaction with the ICC, as well as public confidence and legitimacy of the work of the Court.

Beyond Attribution: Responsibility of Armed Non-State Actors for Reparations in Northern Ireland, Colombia and Uganda

This chapter explores the responsibility of armed non-state actors for reparations to victims. Traditionally international law has focused on the responsibility of the state, and more recently the responsibility of convicted individuals before the International Criminal Court, to provide reparations for international crimes. Yet despite the prevalence of internal armed conflict over the past few decades, there responsibility of armed groups for reparations has been neglected in international law. Although there is a tentative emerging basis for armed groups to provide reparations under international law, such developments have not yet crystallized into hard law. However, when considering the more substantive practice of states in Northern Ireland, Colombia and Uganda, a greater effort can be discerned in ensuring that such organizations are responsible for reparations. This paper finds that not only can armed non-state actors be held collectively responsible for reparations, but due to the growing number of internal armed conflict they can play an important role in ensuring the effectiveness of reparations in remedying victims’ harm. Yet, finding armed groups responsible for reparations is no panacea for accountability, due to the nature of armed conflicts, responsibility may not be distinct, but overlapping and joint, and such groups may face difficulties in meeting their obligations, thus requiring a holistic approach and subsidiary role for the state.

Criminal Justice in Transition: The Northern Ireland Context

This book represents a critical examination of key aspects of crime and criminal justice in Northern Ireland which will have resonance elsewhere. It considers the core aspects of criminal justice policymaking in Northern Ireland which are central to the process of post-conflict transition, including reform of policing, judicial decision-making and correctional services such as probation and prisons. It examines contemporary trends in criminal justice in Northern Ireland as related to various dimensions of crime relating to female offenders, young offenders, sexual and violent offenders, race and criminal justice, community safety and restorative justice. The book also considers the extent to which crime and criminal justice issues in Northern Ireland are being affected by the broader processes of ‘policy transfer’, globalisation and transnationalism and the extent to which criminal justice in Northern Ireland is divergent from the other jurisdictions in the United Kingdom. Written by leading international authorities in the field, the book offers a snapshot of the cutting edge of critical thinking in criminal justice practice and transitional justice contexts.

Effects of peer network interactions on adolescent cannabis use

Purpose
This study capitalises on three waves of longitudinal data from a cohort of 4351 secondary school pupils to examine the effects on individuals’ cannabis use uptake of both peer cannabis use and position within a peer network.

Design/methodology/approach
Both cross-sectional and individual fixed effects models are used to estimate the effect on cannabis use of nominated friends’ cannabis use, of reciprocity and transitivity of nominations across the friendship cluster, and of interactions between these nominated friends. Post hoc analyses parsed the behaviour of reciprocating and non-reciprocating friends.

Findings
Cannabis use varied depending on the stability of friendship network and the degree of reciprocity and interconnectedness within the group. Behavioural influence was strong, but interaction effects were observed between the prevalence of cannabis use among friends, the structure of the friendship group and ego’s proximity to group members. These interactions demonstrate that behavioural influence is more salient in more cohesive groups. When reciprocating and non-reciprocating friends’ mean cannabis use were separated, influence from reciprocating friends was estimated at twice the magnitude of other friends.

Originality/value
While preventing any one individual from using cannabis is likely to have a multiplier effect on classmates, the bonds and interactions between classmates will determine which classmates are affected by this multiplier and the salience of that effect.