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Tuesday 9 February - 3:24 am NZT
Updated at 11:35 pm on 24 June 2013
Hugh Kaufman is a senior policy analyst at the EPA's Office of Solid Waste and Emergency Response. He's got serious concerns about the use of highly toxic oil dispersants in the BP gulf oil spill - the same one used here in the Rena disaster.
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This story was broadcast on
Friday 11 November 2011