There was cocaine on the bed linen, including the part that was tucked under the mattress. Roberta's body contained over fifteen times the lethal dose of the drug. An autopsy revealed that there was cocaine inside Roberta's vagina, but none externally. Police suspected that Amos had washed the body before calling police. Forensic scientist Dr. Phyllis Goode found lipstick and toothmarks on a pillowcase, and other makeup residue, although Roberta did not have any makeup on her when police arrived. The bedsheets were also slightly soiled, although Roberta's body was very clean.