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WASHINGTON, DC - FEBRUARY 03: Flint residents Gladyes Williamson (C) holds a bottle full of contaminated water, and a clump of her hair, alongside Jessica Owens (R), holding a baby bottle full of contaminated water, during a news conference after attending a House Oversight and Government Reform Committee hearing on the Flint, Michigan water crisis on Capitol Hill February 3, 2016 in Washington, DC. Williamson, and Owens traveled to Washington by bus with other flint familes to attend the House hearing on the crisis, and demand that Michigan Gov. Rick Snyder be brought before Congress to testify under oath.  (Photo by Mark Wilson/Getty Images)
WASHINGTON, DC - FEBRUARY 03: Flint residents Gladyes Williamson (C) holds a bottle full of contaminated water, and a clump of her hair, alongside Jessica Owens (R), holding a baby bottle full of contaminated water, during a news conference after attending a House Oversight and Government Reform Committee hearing on the Flint, Michigan water crisis on Capitol Hill February 3, 2016 in Washington, DC. Williamson, and Owens traveled to Washington by bus with other flint familes to attend the House hearing on the crisis, and demand that Michigan Gov. Rick Snyder be brought before Congress to testify under oath.  (Photo by Mark Wilson/Getty Images)

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Did EPA try to keep Flint memo under wraps?

A CNN investigation finds that the EPA had not only known about lead in Flint's water but tried to keep the information under wraps. Sara Ganim reports.

Did EPA try to keep Flint memo under wraps?

A CNN investigation finds that the EPA had not only known about lead in Flint's water but tried to keep the information under wraps. Sara Ganim reports.