Prominent NFL agent Gary Wichard and former University of North Carolina assistant football coach John Blake have engaged in multiple financial transactions since May of 2007, a four-month investigation by Yahoo! Sports has found. Wichard and Blake are now at the center of NCAA and North Carolina Secretary of State probes, which are seeking to determine the nature and scope of alleged agent tampering involving the football program. Those investigations have also focused on Tar Heels defensive tackle Marvin Austin, who has made at least five trips that have come under scrutiny. Two of those trips included training at a...