 Rehnquist's job was to investigate fraud, waste and abuse at H.H.S., including Medicare fraud.During her term, CBS News obtained documents showing that Governor Jeb Bush's chief of staff, Kathleen Shanahan, had left Janet Rehnquist an urgent message and asked her to put off an audit into an alleged $571 million overpayment to the State of Florida, which was discovered in 2002.Rehnquist quickly ordered a two-week delay of the audit.