The federal investigation into the death of convicted sex-trafficker Jeffrey Epstein was marred by significant lapses, experts told CBS News, including the failure by investigators to interview potential witnesses, properly preserve certain evidence and run basic forensic tests.

Nearly two years passed before investigators interviewed the two key corrections officers on duty the night Epstein died in his cell in the Metropolitan Correctional Center in downtown New York City, in what was later ruled a suicide, according to court documents. One of those officers was the only person to attest to seeing Epstein hanging by a bedsheet from his bunk.

And details pulled from 90 photos of the cell and other evidence collected in the hours after Epstein's death — but before FBI agents arrived

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