Why safe drinking water is no safe bet for some U.S. schools

It's not just Flint, Michigan. Over the past few decades, school districts in Los Angeles, New York City, Seattle, Washington and elsewhere have found higher than acceptable lead levels in their students’ drinking water due to old plumbing systems. The NewsHour's April Brown reports on how schools in cities like Ithaca, New York, are confronting the crisis of lead contamination.