It seems that there is no problem so bad that alcohol cannot make it worse.
Cali, Colombia has one of the highest murder rates in the world: 68 per 100 000 in 2008. Just pause for a moment to think what that would mean in your own home town.
At various times during the period 2004 to 2008, depending on political will, alcohol sale and consumption in Cali was prohibited from either 2am, 3am or 4am till 10am. A simple analysis (see fig 2) displays homicide rates according to whether the policy on the day of the homicide was lax (2am), moderate (3am) or strict (4am). The results seem pretty clear but there is also an appropriately complicated time series analyses to take account of various other possible explanations (confounders).
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