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/ Source: TODAY
By Ronan Farrow

On Tuesday California will vote on whether to regulate a chemical that some experts say is one of the most powerful cancer-causing agents in the world. In the latest edition of our special series “Undercovered,” NBC News investigative correspondent Ronan Farrow heads to a community where residents says they’ve been exposed to the threat for years. For more information on TCP contamination in state drinking water, click here