The aim of this study was to test the effect of heightened police enfo
rcement of the NSW Liquor and Registered Clubs Acts on overall crimina
l offences and, specifically, the number of assaults. Ten police patro
ls were included in the study, Five of these patrols were allocated to
the experimental condition and five were allocated to the control con
dition. Beat police in the experimental controls conducted frequent bu
t random visits to predesignated licensed premises over a 2-month peri
od, Police in the control patrols maintained their normal duties, Numb
ers of offences in the experimental and control patrols were then comp
ared for 2 months before the intervention, for the 2-month interventio
n phase and for 2 months post-intervention. Results of the study indic
ated a significant increase in the number of offences in the experimen
tal patrols during the intervention phase. Reasons for this increase a
re discussed.