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President Trump's administration has promised that prototypes for a wall to be built all along the US-Mexico border will be delivered by the end of summer. But will a wall stop people smuggling and drug trafficking? Juan Paullier travels the entire length of the border to discover what life is like in the shadow of the wall. In Reynosa, he joins the Mexican security forces tasked with controlling the drug cartels that make Reynosa the most dangerous city on the frontier.