Drug smugglers in Mexico used a cannon to fire containers full of marijuana over the border into Arizona, the U.S. Border Patrol said Tuesday.

In what appears to be yet another innovation in the drug war arms race, authorities said they found 33 cans of marijuana weighing about 85 pounds, and worth approximately $42,500, strewn across a field on Friday.

A search turned up a carbon dioxide tank likely used to propel the containers, according to The Associated Press.

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The emergence of an actual cannon, though surprising, isn’t an entirely unexpected development. The National Guard said last year that it spotted drug smugglers using catapults. Some have even resorted to homemade submarines — one of which sunk off the coast of Panama just last week.

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