I’m not exactly sure by what Rube Goldbergian chain of events Bratton thinks legalization in Colorado and Washington is causing homicides in New York City, but it’s clear that he thinks there’s a connection. Another NYPD official said the problem appears to be “ripoffs” — not turf battles, but attempted robberies gone wrong.

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Of course, if we want a more direct examination of what effect legal pot might have on homicide, we can just look at the cities where it’s legal. Here’s what we know:

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Homicides dropped 24 percent in Denver last year, the first full year of legalization in Colorado. Robberies were down 3 percent. Burglary was down 9.5 percent. The only crimes that increased significantly were larceny (a property crime, not a violent crime) and arson, which seems unlikely to be related to marijuana. Overall, violent crime dropped 0.7 percent, and property crime dropped 2 percent.

Homicides did increase slightly in Seattle (from 23 to 26), the largest city in the other state to legalize the drug. But it’s more difficult to draw conclusions there because the Washington law was quite a bit stricter than the Colorado law, and still left room for a thriving black market.

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Of course, we only have a year’s worth of data from Colorado. But then, Bratton is drawing broad conclusions based on just eight weeks.