I remember there was an article about the 2001 NFC Title game in the Toronto Star I believe about the Giants tapping into the the Vikings audio system so they knew EVERY coaching call that went out to both Ed McDaniel on defense and Culpepper on offense. In that article there were references about claims during the regular season from the Eagles and Redskins that the Giants under Fassel were doing it for all their home games. Then all of a sudden, the WHOLE thing was wiped from the internet and the news.
