For the second time this year, Mexican authorities have found catapults used by drug traffickers to fling marijuana across the U.S.-Mexico border fence.

Responding to an anonymous tip, troops from Mexico’s army discovered two portable catapults, along with more than a ton of marijuana, at a residence in Agua Prieta, close to the Arizona border.

These kind of low-tech means to get drugs across the border, like packaging drugs to fit through gaps in the fence, illustrates the shortcomings of the border fence as a means to stop traffickers.

In January, InSight Crime featured a video of another catapult confiscated by troops in the area. As the site pointed out, this kind of mechanism is particularly useful for marijuana, as the drug is more bulky and hard to smuggle than heroin and cocaine.

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