There is a timeline. Sandusky did not work for Paterno in 2002 when the alleged attack took place. The timeline is not an opinion.
June 1999 – Sandusky retires from Penn State but still holds emeritus status.
Dec. 28, 1999 – Victim 4 is listed, along with Sandusky's wife, as a member of Sandusky's family party for the 1999 Alamo Bowl.
Summer 2000 – Boy known as Victim 3 meets Sandusky through The Second Mile when he is between seventh and eighth grade.
Fall 2000 – A janitor named James Calhoun observes Sandusky in the showers of the Lasch Football Building with a young boy, known as Victim 8, pinned up against the wall, performing oral sex on the boy. He tells other janitorial staff immediately. Fellow Office of Physical Plant employee Ronald Petrosky cleans the showers at Lasch and sees Sandusky and the boy, who he describes as being between the ages of 11 and 13.
Calhoun tells other physical plant employees what he saw, including Jay Witherite, his immediate supervisor. Witherite tells him to whom he should report the incident. Calhoun was a temporary employee and never makes a report. Victim 8's identity is unknown.
March 1, 2002 – A Penn State graduate assistant enters the locker room at the Lasch Football Building. In the showers, he sees a naked boy, known as Victim 2, whose age he estimates to be 10 years old, being subjected to anal intercourse by a naked Sandusky. The graduate assistant tells his father immediately.
March 2, 2002 – In the morning, the graduate assistant calls Coach Joe Paterno and goes to Paterno's home, where he reports what he has seen.
March 3, 2002 – Paterno calls Tim Curley, Penn State Athletic Director to his home the next day and reports a version of what the grad assistant had said.
March 2002 – Later in the month the graduate assistant is called to a meeting with Curley and Senior Vice President for Finance and Business Gary Schultz. The grad assistant reports what he has seen and Curley and Schultz say they will look into it.
March 27, 2002 (approximate) – The graduate assistant hears from Curley. He is told that Sandusky's locker room keys are taken away and that the incident has been reported to The Second Mile. The graduate assistant is never questioned by university police and no other entity conducts an investigation until the graduate assistant testifies in Grand Jury in December 2010.
http://www.huffingtonpost.com/2011/11/09/penn-state-scandal-timeline-jerry-sandusky_n_1084204.html