ROME (AP) -- A group representing survivors of the capsized Costa Concordia cruise ship say traces of cocaine were found on a sample of the captain's hair but not within the hair strands or in his urine -- which would have indicated he had used the drug.

Italian consumer protection group Codacons said Saturday it has asked prosecutors investigating Captain Francesco Schettino to order another test.

It says analyses show no evidence of cocaine in Schettino's body. But Codacons says traces of cocaine were found on hair samples and in an envelope containing the hair.

It also seeks DNA testing to confirm the samples were Schettino's. Neither prosecutors nor Schettino's lawyer could be reached for comment.

Schettino is under investigation for alleged manslaughter and abandoning his ship, which hit a reef off Italy.