Watch America's Guns: Arming Mexico's Cartels |

Watch documentary | Following the latest appalling calamity in February 2018, when 17 people were slaughtered at the Marjory Stoneman Douglas High School in Florida, the pro and anti-gun ownership lobbies have been engaging in a now familiar debate about the extent to which US gun laws should be tightened up - with the notoriously pro-gun President Donald Trump pledging to stop such carnage happening in the future. This documentary investigates how an astonishing flow of arms from the US has exacerbated crime and conflict in Mexico. How exactly do these weapons get trafficked across the border and why is the US government doing so little to stop the flow?