mario joseph is the most famous lawyer in haiti. he's won landmark victories for victims of political persecution. today, he's collecting medical records. with very limited resources mario is representing thousands of haitians who've been affected by cholera. it's the case of his life - they're trying to sue the united nations. >> the united nations have a lot of money, we don't have. and they have a lot of -- a hundred thousand lawyers. we have only 12! the balance is for them. if they need to comply with the law, the balance is for us! >> the lawsuit - filed in november 2011 - claims that un failures to screen its soldiers for cholera and follow international rules on waste disposal constitute gross negligence. it's based on the un's own investigation which concluded that the nepalese base leaking sewage into the river was a likely source of the outbreak. and it's composed of thousands of stories of personal loss, each one documented by mario and his team. the next meeting is in mirebalais... the town that's home to the un base whe