The more this report is examined, the crumbier it looks. Tony Blankley pretty much nailed it in a column the other day. Thornburgh acted as CBS's attorney, not as its investigator.
Here's the Blankley column:
http://www.townhall.com/columnists/tonyblankley/printtb20050112.shtml
He points out that THORNBURGH HAD BEEN CBS's LAWYER ALL ALONG, and THAT'S WHY he couldn't find anything incriminating.