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Crime

Casinos have been linked to organised crime, with early casinos in Las Vegas originally dominated by the American Mafia and in Macau by Triad syndicates.

According to some police reports, local incidence of reported crime often doubles or triples within three years of a casino's opening. In a 2004 report by the US Department of Justice, researchers interviewed people who had been arrested in Las Vegas and Des Moines and found that the percentage of problem or pathological gamblers among the arrestees was three to five times higher than in the general population.

It has been said that economic studies showing a positive relationship between casinos and crime usually fail to consider the visiting population: they count crimes committed by visitors but do not count visitors in the population measure, which overstates the crime rate. Part of the reason this methodology is used, despite the overstatement, is that reliable data on tourist count are often not available.