The Dunedin City Council has resorted to putting a helicopter in the sky as it scrambles to discover the source of lead poisoning to an East Otago water supply. Nearly six months after receiving the first positive test results, the council finally advised Waikouaiti and Karitane residents this week not to use tap water. Now some locals feel they are still being kept in the dark about how dangerous the poisoning could be. Anan Zaki reports.