Considering the media was all over his DUIs well before this alleged incident, the fact that this wasn't reported anywhere makes it your own little invention no matter what your own little mole in South Bend would have you believe. This was also at a time when relationships between ND and local police were particularly bad so if this actually happened it wouldn't have gone unnoticed by the local press nor kept under wraps by the police and prosecutors.
The idea that ND would look the other way or that the S.B. media (which lives for Notre Dame generated drama) wouldn't report one iota about this when, generally speaking, the South Bend cops as well as the prosecutor's office despise most everything ND is sheer fantasy. And then you throw in your make-believe factoid that "lawyers for ND" took care of him makes it even more laughable.
But you keep trying.