Sumter Police Chief Russel Roark said officers from around the state are working with experts in landfill searches with the National Center for Missing and Exploited Children to try to find Nevaeh Adams' remains.
Roark says Daunte Johnson told investigators he killed the girl and her mother, 29-year-old Sharee Bradley, in a Sumter apartment on Aug. 5 and he dumped the girl's body in a trash bin.
Roark says forensic evidence shows the girl is dead.
Authorities say more than two dozen officers have already sifted through by hand 460,000 pounds (209,000 kilograms) of garbage looking for the girl.
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