Sandusky, who spent decades on the Penn State football staff and was defensive coordinator during two national championship seasons, was convicted in June of sexually abusing 10 boys over 15 years. He has maintained his innocence and is serving a 30- to 60-year prison sentence.
Curley, 58, is the athletic director on leave while he serves out the last year of his contract. Schultz, 63, has retired as vice president for business and finance.
In a pair of pretrial motions filed this week regarding their earlier charges, Curley and Schultz both focused on the role played by Cynthia Baldwin, the university's then-chief counsel who accompanied them to their grand jury appearances. They argued charges should be dismissed, or grand jury testimony suppressed, because they believed Baldwin was representing them.
Baldwin's grand jury testimony was a key piece of the evidence used to support the new charges.
"We were stunned, we were flabbergasted that she would testify against our clients," said Curley's lawyer, Caroline Roberto.
Farrell said Baldwin, a former state Supreme Court justice, "has betrayed her clients, her profession and testified falsely."
Baldwin's lawyer Charles De Monaco referred a reporter to a statement issued this summer in which he defended her, saying she "at all times fulfilled her obligations to the university and its agents."
Spanier, 64, of State College, had been university president for 16 years when he was forced out after Sandusky's November 2011 arrest. He remains a faculty member but was placed on paid leave Thursday.