Food safety investigators who are trying to tracing the source of beef contaminated by a pesticide that was sent to South Korea have had to start the tracing process again.
Tests in South Korea found small traces of the insecticide endosulfan in a carton of beef that had been processed at a Waikato meat plant.
South Korean authorities have stopped further imports of beef from that processing plant while the source of the contamination is traced. Beef from anywhere else in New Zealand is still allowed into South Korea.
Food Safety Authority director of compliance and investigation, Geoff Allen, says investigators had been working on the wrong carton of beef.
He says the authority now has now identified the correct carton, and has re-started the investigation.