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SUMMARY:‘Policing Hot Spots in London’ - Dr Barak Ariel\,
DTSTART:20191121T173000Z
DTEND:20191121T190000Z
UID:TALK134245@talks.cam.ac.uk
CONTACT:R Greene
DESCRIPTION:\n\nOur understanding of causality and effect size in randomis
 ed field experiments is challenged by variations in levels of baseline tre
 atment dosage in control groups across experiments testing similar treatme
 nts. The clearest design is to compare treated cases with no-treatment con
 trols in a sample that lacks any prior treatment at baseline. We applied t
 hat strategy in a randomised test of hot spots police patrols on the previ
 ously never-patrolled\, track-level platforms of the London Underground. T
 he effect of 23\,272 police arrivals at the treatment hot spots over 26 we
 eks was to reduce public calls for service by 21% on treated platforms rel
 ative to controls\, yet interestingly primarily when police were absent (9
 7 percent of the measured effect). The overall effect of the patrols was s
 ix times larger than the mean standardised effect size found in the leadin
 g systematic review on hot spots policing\, with strong evidence of residu
 al deterrence and no evidence of local displacement. In this Thursday Semi
 nar\, the results of this experiment\, and how the study was executed\, wi
 ll be presented. Given these findings\, and their implications for both re
 search and policy\, the Seminar will centre on future policing strategies\
 , given the tide of 20\,000 new police officers who are expected to enter 
 police forces across England and Wales. As questions are now raised about 
 how to best utilise these officers in the most effective way\, the finding
 s of this experiment have practical considerations for optimal deployment 
 strategies.\n
LOCATION:B3 Institute of Criminology Sidgwick Site
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