Thorp made the comment at a meeting of the UNC Board of Governors' Committee on University Governance.
ABC11 asked Thorp if Davis should have known.
"…you can’t prove a negative. But we don’t have any evidence that Coach Davis knew about that and we’ve been looking for a long time," he said.
What Davis knew and when he knew it has been the topic of intense media scrutiny since news of the scandals broke this summer.
UNC's student newspaper even called on Davis to leave after this season -- saying he either had direct knowledge of major problems or was egregiously ignorant.
The scandal led to the resignation of assistant coach John Blake.
Defensive tackle Marvin Austin and wide receiver Greg Little were kicked off the team after the NCAA found they had accepted thousands of dollars in trips and gifts from agents.
The probe continues and it's unclear what sanctions UNC might face from the NCAA.
ABC11, along with other media organizations, has sued UNC for access to more records.