Here is an interesting post from Brian Cook at MGoBlog.
Can't say I agree with how he couched it...but it is an interesting exercise.
USC's lack of institutional control charge was the major factor here and while Ohio State has not yet been hit with that allegation the Pac-10 has a primer on what does and does not qualify for a LOIC charge featuring a lot of components that should make OSU fans nervous.
Specifically called out is a head coach's responsibility:
A head coach fails to create and maintain an atmosphere for compliance within the program — the coach supervises or fails to monitor the activities of assistant coaches regarding compliance.
A head coach has special obligation to establish a spirit of compliance among the entire team, including assistant coaches, other staff and student-athletes. The head coach must generally observe the activities of assistant coaches and staff to determine if they are acting in compliance with NCAA rules. Too often, when assistant coaches are involved in a web of serious violations, head coaches profess ignorance, saying that they were too busy to know what was occurring and that they trusted their assistants. Such a
failure by head coaches to control their teams, alone or with the assistance of a staff member with compliance responsibilities, is a lack of institutional control.
This is not to imply that every violation by an assistant coach involves a lack of institutional control. If the head coach sets a proper tone of compliance and monitors the activities of all assistant coaches in the sport, the head coach cannot be charged with the secretive activities of an assistant bent on violating NCAA rules.
In this case Tressel can't even attempt to pass the buck since he is directly responsible.