>> ifill: and from liberia, special correspondent steve sapienza partners with a local journalist to ask why the government hasn't solved the country's water crisis. >> one recent world bank study found coax-- and indicator of widespread fecal contamination-- in 58% of water sources across monrovia. >> brown: that's all ahead on tonight's "newshour." major funding for the pbs newshour has been provided by: >> and by the bill and melinda gates foundation. dedicated to the idea that all people deserve the chance to live a healthy productive life. and with the ongoing support of these institutions and foundations. and... this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. >> ifill: the u.s. supreme court heard arguments today over arizona's immigration law. the justices appeared skeptical of the administration's claim that the state had overstepped federal law. following the arguments, supporters and critics of the measure made their case outside the court. >> this law is a paradigm of coop

>> ifill: and from liberia, special correspondent steve sapienza partners with a local journalist to ask why the government hasn't solved the country's water crisis. >> one recent world bank study found coax-- and indicator of widespread fecal contamination-- in 58% of water sources across monrovia. >> brown: that's all ahead on tonight's "newshour." major funding for the pbs newshour has been provided by: >> and by the bill and melinda gates foundation. dedicated to the idea that all people deserve the chance to live a healthy productive life. and with the ongoing support of these institutions and foundations. and... this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. >> ifill: the u.s. supreme court heard arguments today over arizona's immigration law. the justices appeared skeptical of the administration's claim that the state had overstepped federal law. following the arguments, supporters and critics of the measure made their case outside the court. >> this law is a paradigm of coop

special correspondent steve sapienza has another of his collaborations with african journalists covering the continent's water issues. his story from the ivory coast was done in partnership with the pulitzer center on crisis reporting. >> reporter: the west african nation of ivory coast was once a beacon of prosperity for the region. but in 2002, a civil war divided the country between north and south, and set the stage for further turmoil. recently violence erupted in 2010 when incumbent laurent gbagbo refused to cede power to alassane ouattara after a disputed presidential election. i met journalist selay kouassi on the rooftop of his apartment building, the spot where he watched his country descend into chaos. >> i was here, standing here, from my rooftop, i could see u.n. helicopters and helicopters of french troops shooting rockets on the presidential palace. it was something nobody experienced before. >> reporter: selay continued reporting from the streets of the port-city, abidjan, as war engulfed the entire country, killing thousands of people and leaving nearly a million homeles