Feb 10, 2011 | 09:51 GMT
Mexican Soldiers leave the scene of a crime where a man was killed by gun fire in downtown Tijuana, Baja California state, Mexico, on April 21, 2019.
(GUILLERMO ARIAS/AFP/Getty Images)
It is a common claim that almost all the weapons used by Mexican drug cartels come from the United States, but the numbers don't add up....
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