L’émergence des cryptomarchés, ayant mené au développement de nouvelles méthodes de distribution de drogues et autres produits et services illicites (Walsh et Phil, 2011), pose divers défis aux forces de l’ordre. Ces dernières, souhaitant limiter la portée de leurs actions, adoptent habituellement des stratégies similaires à celles utilisées auprès de réseaux de drogues traditionnels (Décary-Hétu et Giommoni, 2016). Toutefois, les différences entre ces marchés et ceux en ligne génèrent des questionnements quant à l’efficacité de ces techniques. Jusqu’à présent, peu d’études s’y sont intéressées, mais celles qui ont été recensées sont effectivement parvenues à des résultats peu enthousiastes. Ces recherches ont conclu que les activités tentées jusqu’à présent par la police n’avaient pas influencé le marché de façon significativement durable (Décary-Hétu et Giommoni, 2016; Van Buskirk, Roxburgh, Farrell et Burns; 2014; Soska et Christin, 2015). Dans cette optique, ce mémoire pose un regard sur l’impact d’une opération policière n’ayant toujours pas été analysée à ce jour, qui, en collaboration avec les services postaux, a mené à une arrestation et à plusieurs saisies en lien avec des vendeurs de cannabis canadiens opérant sur les cryptomarchés. Après avoir analysé les données recueillies selon un modèle d’évaluation d’impact considérant l’offre, la demande et le prix, les résultats démontrent qu’au contraire de ce que nous dicte la littérature, l’opération a eu pour effet de diminuer significativement à long terme certains indicateurs tels que le nombre de transactions, les parts des marchés de transactions, le nombre de vendeurs actifs, les revenus engendrés et les parts de marchés de revenus, le tout au sein du marché de cannabis canadien. Le modèle de prédiction utilisé, se basant sur des analyses de séries chronologiques interrompues (ARIMA), nous a permis de déterminer que l’opération étudiée avait contribué à éviter 2452 transactions sur ce qui était normalement prévu par la tendance pré-intervention, soulignant une baisse considérable de 101%, versus 91% internationalement (différence de 10%) 18 mois après le début de l’intervention. / The emergence of cryptomarkets, which has led to the development of new methods of distributing drugs and other illicit products and services (Walsh and Phil, 2011), poses various challenges to the police. The latter, wishing to limit the scope of their actions, usually adopt strategies similar to those used with traditional drug networks (Décary-Hétu and Giommoni, 2016). However, the differences between these markets and those online raise questions about the effectiveness of these techniques. So far, few studies have focused on that topic, but those that have been identified have achieved unenthusiastic results. This research concluded that the activities attempted to date by the police have not influenced the market in a significantly sustainable manner (Décary-Hétu and Giommoni, 2016, Van Buskirk, Roxburgh, Farrell and Burns, 2014, Soska and Christin, 2015). With this in mind, this Masters thesis looks at the impact of a police operation that has not yet been analyzed, which, in collaboration with the postal services, has made an arrest and several seizures in connection with cryptomarket sellers. After analyzing the data collected according to an impact evaluation model considering supply, demand and price, the results show that, contrary to what the literature dictates, the operation had the effect of reducing significantly long-term indicators such as the number of transactions, shares of trading markets, the number of active sellers, income generated and market share of income, all within the Canadian cannabis market. The prediction model used, based on interrupted time series analyzes (ARIMA), allowed us to determine that the study had avoided 2452 transactions normally planned by the trend before the intervention, showing us a considerable drop of 101%, comparatively to 91% internationally (difference of 10%) 18 months after the beginning of the intervention.

[pt] Atualmente, diferenças de visões de mundo, especialmente as de natureza ideológica e política, vêm promovendo um clima de polarização, seja no ambiente off-line ou online. Uma das munições utilizadas na guerra do nós contra eles é o conhecimento. Discussões acaloradas são sustentadas por uma disputa de quem tem razão, quem está certo ao defender determinada posição. À luz de uma abordagem que integra a teoria do conhecimento aos estudos sobre postura epistêmica, na perspectiva da Análise da Conversa Etnometodológica, este trabalho tem por objetivo examinar como são construídas as batalhas epistêmicas na seção de comentários de um jornal digital, hospedado no YouTube, que posta vídeos de operações policiais avaliadas como abusivas. Os resultados demonstram que os participantes buscam derrotar o oponente invocando um desiquilíbrio epistêmico entre as partes. Para tanto, mobilizam diferentes recursos linguísticos para reivindicar uma postura epistêmica de mais conhecimento e deslegitimam posições que não são sustentadas por conhecimentos fundamentados e confiáveis. Os resultados revelam também que, em termos de efeitos argumentativos, as batalhas epistêmicas são um jogo sem vencedores. Elas não contribuem para modificar crenças enganosas, informações falsas e preconceitos. Elas servem apenas para reforçar a construção de identidades totalizantes, dificultando qualquer possibilidade de entendimento mútuo, ainda que não haja acordo. / [en] Currently, differences in worldviews, especially those of ideological and political nature, are promoting a climate of polarization, whether in the offline or online environment. One of the ammunitions used in the we versus they war is knowledge. Heated discussions are supported by a dispute of right or wrong, that is, who is right in defending a determined position. In the light of an approach that integrates the theory of knowledge to the studies on epistemic stance, from the perspective of the Conversation Analysis, this paper aims to examine how epistemic changes are constructed in the comments section of a digital newspaper, hosted on YouTube, which posts videos of police operations evaluated as abusive. The results demonstrate that the participants seek to defeat the opponent by invoking an epistemic imbalance between the parties. To this end, they mobilize different linguistic resources to claim an epistemic stance of more knowledge and delegitimize positions that are not supported by reliable and well-founded knowledge. The results also reveal that, in terms of argumentative effects, epistemic battles are a game with no winners. They do not contribute to modifying misleading beliefs, false information, and prejudices. They only serve to reinforce the construction of totalizing identities, hindering any possibility of mutual understanding, even if there is no agreement.

Mémoire numérisé par la Division de la gestion de documents et des archives de l'Université de Montréal

Mémoire numérisé par la Division de la gestion de documents et des archives de l'Université de Montréal.