Possibly, but the effect is modest. A 2008 meta-analysis by researchers at the University of Glamorgan provides the most authoritative answer on this question to date, looking at 19 studies conducted in the United States, the United Kingdom, Canada, and Australia since 1977. Its authors conclude that neighborhood watch programs produce a 16-percent drop in crime, on average, but they concede research in this field is complicated. Many of the studies are anecdotal. Very few are adequately controlled or randomized, and the best-known experiment to date?one that was carried out in Minneapolis during the 1980s?showed no impact on crime whatsoever. Results can also vary tremendously between communities. As a result, it?s difficult to state with any authority whether neighborhood watch has an effect, or what that effect might be.
Source: http://feeds.slate.com/click.phdo?i=3fcf32c534ed6bc0945095fe07beb046
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