This thesis constitutes one of the first attempts to investigate police use of the electric-shock weapon the Taser in England and Wales, between 2004 – 2014. The research combines an inter-disciplinary approach—drawing on the criminology and policing literature, as well as on Science and Technology Studies (STS), Actor Network Theory (ANT) and Social Psychology—with mixed methods and novel data sources. It benefits from virtually unprecedented access to sources including internal police datasets, the College of Policing’s Lead Instructor Taser Training, Taser training in two forces, interviews with police officers and individuals subject to Taser. The thesis first explores how, and in what circumstances, Taser is used in selected forces in England and Wales, before looking at consequences of use for officers and subjects. It then discusses the broader legal, policy, training and accountability framework around the weapon, via an examination of three inter-related and widespread stories told about the weapon and its regulation: that Taser is a neutral tool, that appropriate use is a responsibility for, and at the discretion of, individual officers, and that it is subject to robust accountability mechanisms. It is argued that these stories, whilst not incorrect, are incomplete. Descriptions of the weapon as a neutral tool are understandable but not always convincing, decisions on its use are not just the preserve of individual officers, and accountability mechanisms are not always as robust as is claimed. The conclusions have implications for practitioners and for the literature on Taser. They also contribute to wider criminology debates around use of force, discretion and accountability, and to sociological debates about the relevance of STS and ANT approaches. Finally, the thesis not only highlights areas for future research, but also highlights some tentative recommendations for policy and practice.

L'objectif scientifique de la thèse est de contribuer à améliorer la compréhension des mécanismes lésionnels découlant de l’impact non pénétrant d’un projectile en région thoracique latérale. Concrètement, l’application concerne l’amélioration de l’évaluation du potentiel lésionnel et l’optimisation de projectiles dits « à létalité réduite ». Cette étude a été menée dans le cadre du projet PARCHOC, associant la Délégation Générale pour l’Armement-Techniques Terrestres, le laboratoire PRISME de l’université d’Orléans, les sociétés Nexter munitions, ITC élastomère et ATCOM télémétrie. Il s’agit notamment de mettre en évidence les paramètres des projectiles qui doivent être maîtrisés pour limiter le risque lésionnel. Nous avons d’abord réalisé une étude pour caractériser des projectiles d'essais constitués d'un culot rigide et d'une ogive en mousse d'élastomère. Les propriétés dynamiques des élastomères ont été caractérisées par le système des barres de Hopkinson. Ce travail a permis la mise au point d'un modèle numérique de comportement des élastomères. Des essais ainsi que des simulations d’impacts sur cibles rigides ont ensuite été réalisés afin d'étudier l'influence du couple masse-vitesse et des caractéristiques mécaniques des élastomères sur le chargement généré. Dans la seconde partie de l'étude, des essais sur cibles biologiques instrumentées ont été menés à l’aide des projectiles d'études précédemment caractérisés. Les résultats expérimentaux et numériques montrent que la dangerosité des projectiles est liée à l’action qu’ils exercent sur la structure osseuse thoracique après sa fragilisation et que le mécanisme lésionnel est fortement dépendant de l’impulsion transmise par le projectile lors de l’impact. / The scientific objective of the thesis was to make a contribution in the understanding of the injury mechanisms following the blunt impact of a projectile on the lateral thoracic region. Practically, the application concerns safety certification and optimization of less-lethal projectile. This research was supported by the project PARCHOC partners: the Délégation Générale pour l’Armement-techniques terrestres, the PRISME laboratory (Orléans university),the companies Nexter munitions, ITC élastomère and ATCOM télémétrie. In particular, we have sought the principal projectile parameters which must be controlled to limit injury risk. Firstly, we have performed a study based on specialized test projectiles, made with a rear rigid part and soft foam (elastomeric) nose. The foams’ chemical formulations were made so that the dynamical properties (measured with the Hopkinson bar apparatus) were those expected. Experiments and simulations of the impacts on rigid wall target have been made to investigate how the mass-velocity couple and the foam material properties influence the impact force. Secondly, an experimental campaign was made using pig anatomical parts and the projectiles previously studied. Experimental and numerical results obtained during the thesis demonstrate that the dangerous nature of the projectiles used is essentially linked to the action on the thoracic bone structure after it has been weakened by the impact. Furthermore, injuries are strongly dependent upon the impulse transmitted during the impact.

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