M67 grenades that were supplied to Central America during the cold war has ended up in the hands of Mexican drug cartels. Agents with the United States Alcohol, Tobacco, Firearm and Explosives (ATF) have traced grenades from the United States that were originally sent to Guatemala, El Salvador, Honduras and Nicaragua. Between 1980 and 1993, around 260,000 M67 grenades were sent from the United States to El Salvador.
Many of these grenades are now being sold on the black market in Mexico. According to author Ioan Grillo, the grenades are being sold to the drug cartels for $100 to $500 per grenade.
Source: Ioan Grillo, El Narco: Inside Mexico’s Criminal Insurgency, Bloomsbury Press: New York, 2012, page 217.