How Much Time Should the Police Spend at Crime Hot Spots? Answers from a Police Agency Directed Randomized Field Trial in Sacramento, California

Hot spots policing has been shown to be an effective strategy for reducing crime across a number of rigorous evaluations, but despite this strong body of research, there still exist gaps in our knowledge of how officers can best respond to hot spots. We report on a randomized experiment in Sacramento, California that begins to address these gaps by testing the recommendation from prior research that police officers randomly rotate between hot spots, spending about 15 min patrolling in each. Our results suggest significant overall declines in both calls for service and crime incidents in the treatment hot spots relative to the controls. Additionally, the study was carried out primarily by the Sacramento Police Department without any outside funding. In an era of limited economic resources for policing, this experiment suggests a model by which police agencies can take ownership of science and oversee the implementation and evaluation of evidence-based interventions.

[1]  F. Wilcoxon.  Individual Comparisons by Ranking Methods , 1945 .

[2]  George L. Kelling,et al.  The Kansas City preventive patrol experiment : a technical report , 1974 .

[3]  T. Cook,et al.  Quasi-experimentation: Design & analysis issues for field settings , 1979 .

[4]  L. Delbeke.  Quasi-experimentation - design and analysis issues for field settings - cook,td, campbell,dt , 1980 .

[5]  B. Risman.  The Kansas City Preventive Patrol Experiment , 1980 .

[6]  David P. Farrington,et al.  Randomized Experiments on Crime and Justice , 1983, Crime and Justice.

[7]  William Spelman,et al.  Calling the police : citizen reporting of serious crime , 1984 .

[8]  Patrick R. Gartin,et al.  Hot Spots of Predatory Crime: Routine Activities and the Criminology of Place , 1989 .

[9]  Mark H. Moore,et al.  Beyond 911: A New Era For Policing , 1990 .

[10]  L. Sherman.  Police Crackdowns: Initial and Residual Deterrence , 1990, Crime and Justice.

[11]  Gail Mason,et al.  Design Sensitivity in Criminal Justice Experiments , 1993, Crime and Justice.

[12]  Christopher S. Koper,et al.  Just enough police presence: Reducing crime and disorderly behavior by optimizing patrol time in crime hot spots , 1995 .

[13]  Lawrence W. Sherman,et al.  General deterrent effects of police patrol in crime “hot spots”: A randomized, controlled trial , 1995 .

[14]  D. Weisburd,et al.  Policing drug hot spots: The Jersey City drug market analysis experiment , 1995 .

[15]  David Weisburd,et al.  Statistics in Criminal Justice , 1997 .

[16]  Anthony A. Braga,et al.  Problem-oriented policing in violent crime places: A randomized controlled experiment , 1999 .

[17]  R. Boruch,et al.  The Importance of Randomized Field Trials , 2000 .

[18]  W. Shadish,et al.  Experimental and Quasi-Experimental Designs for Generalized Causal Inference , 2001 .

[19]  Anthony A. Braga,et al.  The Effects of Hot Spots Policing on Crime , 2001 .

[20]  R. MacCoun.  Experimental and Quasi‐Experimental Designs for Generalized Causal Inference, by William R. Shadish, Thomas D. Cook, and Donald T. Campbell. Boston: Houghton Mifflin, 2001, 623 pp., $65.56. , 2003 .

[21]  D. Weisburd.  Ethical Practice and Evaluation of Interventions in Crime and Justice , 2003, Evaluation review.

[22]  J. Eck,et al.  What Can Police Do to Reduce Crime, Disorder, and Fear? , 2004 .

[23]  S. Bushway,et al.  Trajectories of Crime at Places: A Longitudinal Study of Street Segments in the City of Seattle , 2004 .

[24]  Brian Lawton,et al.  Police Officers on Drug Corners in Philadelphia, Drug Crime, and Violent Crime: Intended, Diffusion, and Displacement Impacts , 2005 .

[25]  James Frank,et al.  Managing Police Patrol Time: The Role of Supervisor Directives , 2005 .

[26]  Anthony A. Braga,et al.  Hot spots policing and crime prevention: A systematic review of randomized controlled trials , 2005 .

[27]  Howard Giles,et al.  Fairness and Effectiveness in Policing: The Evidence , 2005 .

[28]  Jessaca Spybrook,et al.  Optimal Design for Longitudinal and Multilevel Research: Documentation for the "Optimal Design" Software , 2006 .

[29]  D. Weisburd,et al.  Police Innovation: Advocate Hot spots policing as a model for police innovation , 2006 .

[30]  Ronald V. Clarke,et al.  DIFFUSION OF CRIME CONTROL BENEFITS: OBSERVATIONS ON THE REVERSE OF DISPLACEMENT , 2006 .

[31]  John E. Eck,et al.  DOES CRIME JUST MOVE AROUND THE CORNER? A CONTROLLED STUDY OF SPATIAL DISPLACEMENT AND DIFFUSION OF CRIME CONTROL BENEFITS* , 2006 .

[32]  L. Sherman.  The power few: experimental criminology and the reduction of harm , 2007 .

[33]  T. Wigram,et al.  Therapeutic Songwriting in Music Therapy , 2008 .

[34]  Anthony A. Braga,et al.  POLICING CRIME AND DISORDER HOT SPOTS: A RANDOMIZED CONTROLLED TRIAL* , 2008 .

[35]  W. Broer,et al.  Evidence based policing , 2010 .

[36]  Anthony A. Braga,et al.  Policing Problem Places: Crime Hot Spots and Effective Prevention , 2010 .

[37]  Anthony A. Braga,et al.  Policing Problem Places , 2010 .

[38]  Christopher S. Koper,et al.  The Evidence-Based Policing Matrix , 2011 .

[39]  Bruce G. Taylor,et al.  A randomized controlled trial of different policing strategies at hot spots of violent crime , 2011 .

[40]  David Weisburd,et al.  Police Science: Toward a New Paradigm , 2012 .

[41]  Nick Tilley,et al.  Policing Problem Places: Crime Hot Spots and Effective Prevention , 2012 .

[42]  Elizabeth R. Groff,et al.  The Criminology of Place: Street Segments and Our Understanding of the Crime Problem , 2012 .

[43]  David M. Hureau,et al.  The Effects of Hot Spots Policing on Crime: An Updated Systematic Review and Meta-Analysis , 2014 .

[44]  Cody W. Telep,et al.  The Efficiency of Place-Based Policing , 2015 .