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Hello and welcome to the intelligence from The Economist.

In New York, I'm John Fastman.

And in London, I'm Jason Palmer.

Every weekday, we provide a fresh perspective on the events shaping your world.

For years, despite Mexican cartels booming business in sending illegal drugs north,

drug use rates in Mexico itself remain quite low.

But with the rise of synthetic drugs, that's starting to change, with grievous social consequences.

And you can't carry a knife onto a flight or fireworks. You can't even carry more than

100 milliliters of liquid, so it seems pretty obvious that toting a gun on board is out

of the question. Yet a surprising number of Americans try just that.

...