Research Summary In this study, we investigate how a police officer's exposure to peers accused of misconduct shapes his or her involvement in excessive use of force. By drawing from 8,642 Chicago police officers named in multiple complaints, we reconstruct police misconduct ego‐networks using complaint records. Our results show that officer involvement in excessive use of force complaints is predicted by having a greater proportion of co‐accused with a history of such behaviors. Policy Implications Our findings indicate officers’ peers may serve as social conduits through which misconduct may be learned and transmitted. Isolating officers that engage in improper use of force, at least until problematic behaviors are addressed, seems to be critical to reducing police misconduct and department‐wide citizen complaints. Future studies should be aimed at investigating how social networks shape police misconduct and the ways network analysis might be used to diffuse intervention strategies within departments.

What leads a minority of criminal groups to persist over time? Although most criminal groups are characterized by short life spans, a subset manages to survive extended periods. Contemporary research on criminal groups has been primarily descriptive and static, leaving important questions on the correlates of group persistence unanswered. By drawing from competing perspectives on the relationship between cohesion and group persistence, we apply a longitudinal approach to examine the network dynamics influencing the life span of criminal groups. We use 9 years of official data on the criminal and social networks of gang associates in Montreal, Quebec, Canada, to delineate criminal group boundaries and examine variation in group duration. Our statistical approach simultaneously considers within‐ and between‐group attributes to isolate how groups’ cohesion, as well as their embeddedness in the wider gang structure, impacts survival. Our results show that group survival is a function of their cohesion and embeddedness. Yet, the relationship is not direct but moderated by group size. Whereas large groups that adopt closed structures are more likely to persist, small groups’ survival depends on less cohesive and more versatile structures. In the discussion, we consider the impact of these findings for the continued understanding of group trajectories.

In the face of market uncertainty, illicit actors on the darkweb mitigate risk by displacing their operations across digital marketplaces. In this study, we reconstruct market networks created by vendor displacement to examine how digital marketplaces are connected on the darkweb and identify the properties that drive vendor flows before and after a law enforcement disruption. Findings show that vendors’ movement across digital marketplaces creates a highly connected ecosystem; nearly all markets are directly or indirectly connected. These network characteristics remain stable following a law enforcement operation; prior vendor flows predict vendor movement before and after the interdiction. The findings inform work on collective patterns in offender decision-making and extend discussions of displacement into digital spaces.

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Objectives: This study looks at whether social opportunity structures are associated with transitions into more serious drug market offending. Our focus is on the speed at which transitions occurred, and whether variations in criminal embeddedness play a role in explaining this. Methods: A survey of 520 North American cannabis cultivators allowed us to assess one dimension of the criminal career—escalation—looking at the speed of transitions from cannabis user to grower. Our main predictor, criminal embeddedness, was measured through the presence of a cultivation mentor involved in cannabis cultivation. Results: Cox proportional hazard regression analysis demonstrated late cannabis use onset and an indicator of the number of drugs used beyond cannabis were found to accelerate transitions. In addition, within-person changes in mentorship were found to influence the timing of escalation, with meeting a mentor associated with quicker transitions into cannabis cultivation. Conclusions: Findings emphasize the role of mentors as gateways into new milieus. Results support increased attention to the immediate social networks and broader social opportunity structures in which offenders and would-be offenders are embedded as major factors driving the timing of onset into more serious criminal pathways.