By David Weisburd, Laura A. Wyckoff, Justin Ready, John E. Eck, Joshua C. Hinkle, Frank Gajewski

This study addresses the longstanding concern that focused crime prevention efforts—such as policing "hot spots"—might simply displace crime to nearby areas. While displacement has been a major critique of place-based policing, empirical studies have rarely been designed specifically to assess its presence or measure its impact. The authors designed and implemented a controlled field experiment in Jersey City, New Jersey, to examine whether such displacement occurs or whether crime control efforts might instead lead to a diffusion of benefits—i.e., crime reductions in areas surrounding targeted sites. The study focused on two areas: one known for street-level drug dealing and the other for prostitution. Using over 6,000 social observations, interviews, and ethnographic fieldwork, the researchers found little evidence of spatial displacement and instead documented significant diffusion of crime control benefits to adjacent areas. The findings challenge assumptions that crime merely moves elsewhere and reinforce the effectiveness of concentrated policing in reducing crime beyond targeted hot spots.

(Criminology, Volume 44, Number 3, 2006, pp. 549–594)

By Peng Chen and Justin Kurland

“Strike Hard” is an enhanced law-enforcement strategy in China that aims to suppress crime, but measurement of the crime-reducing effect and potential changes in the spatiotemporal concentration of crime associated with “Strike Hard” remains unknown. This paper seeks to examine the impact, if any, of “Strike Hard” on the spatiotemporal clustering of burglary incidents. Two and half years of residential burglary incidents from Chaoyang, Beijing is used to examine repeat and near-repeat burglary incidents before, during, and after the “Strike Hard” intervention and a new technique that enables the comparison of repeat and near repeat patterns across di erent temporal periods is introduced to achieve this. The results demonstrate the intervention disrupted the repeat pattern during the “Strike Hard” period reducing the observed ratio of single-day repeat burglaries by 155%; however, these same single-day repeat burglary events increased by 41% after the cessation of the intervention. Findings with respect to near repeats are less remarkable with nominal evidence to support that the intervention produced a significant decrease, but coupled with other results, suggest that spatiotemporal displacement may have been an undesired by-product of “Strike Hard”. This study from a non-Western setting provides further evidence of the generalizability of findings related to repeat and near-repeat patterns of burglary and further highlights the limited preventative effects that the “Strike Hard” enhanced law enforcement campaign had on burglary

ISPRS Int. J. Geo-Inf. 2020, 9, 150