The New South Wales (NSW) Law Enforcement (Powers and Responsibilities) Act 2002 gave the NSW Police the power in certain circumstances the power to stop, search and detain a person without warrant. The same legislation gave the police the power to direct a person to move on from a place if they believe on reasonable grounds that the person in question is obstructing traffic or another person; engaging in behaviour that is considered harassment or intimidation to another person (or people); behaving in a way that is causing or likely to cause fear to a reasonable person or present in the place in order to unlawfully supply or cause another person to unlawfully supply drugs. The exercise of these powers has attracted considerable controversy, but little is known about their effectiveness in controlling crime. We investigate the relationship between police activity and crime using panel data of 17 Local Area Command for the period 2001 to 2013. We find a significant and strongly negative long-run relationship between both indices of police activity and each of break and enter, motor vehicle theft and robbery. No significant long-run relationship is found between assault and move-on directions. The person search activity is negatively related to assault, but the effect is weak; with a 10% increase in person search only resulting in a 0.5% fall in assaults. The implications for the exercise of police move-on and search powers are discussed.

2002年新南威尔士州（NSW）执法（权力和责任）法赋予NSW警察某些情况下的权力，该权力有权在没有逮捕证的情况下阻止，搜查和拘留一个人。同样的立法赋予警察权力，只要他们有合理的理由相信一个人正在阻碍交通或另一个人，便可以指示该人离开某个地方继续前进；从事被视为骚扰或恐吓他人的行为；以非法供应或导致他人非法供应毒品的方式，以引起或可能引起合理的人或在该地点出现的恐惧的方式行事。这些权力的行使引起了很大的争议，但人们对于控制犯罪的效力知之甚少。我们使用17个地区指挥部2001年至2013年的面板数据调查了警察活动与犯罪之间的关系。我们发现，警察活动的两个指标与闯入和闯入，机动车中的两个指标之间均存在显着且强烈的负长期关系盗窃和抢劫。在突击和前进方向之间未发现明显的长期关系。人员搜索活动与攻击负相关，但效果较弱；人员搜索量增加10％，只会使攻击次数减少0.5％。讨论了行使警察上任权和搜查权的意义。我们发现，警察活动的两个指标与闯入，机动车盗窃和抢劫中的每个指标之间都存在着显着的长期负相关关系。在突击和前进方向之间未发现明显的长期关系。人员搜索活动与攻击负相关，但效果较弱；人员搜索量增加10％，只会使攻击次数减少0.5％。讨论了行使警察上任权和搜查权的意义。我们发现，警察活动的两个指标与闯入，机动车盗窃和抢劫中的每个指标之间都存在着显着的长期负相关关系。在突击和前进方向之间未发现明显的长期关系。人员搜索活动与攻击负相关，但效果较弱；人员搜索量增加10％，只会使攻击次数减少0.5％。讨论了行使警察上任权和搜查权的意义。