Govt stats are frequently manipulated. Unemployment is not figured the same as it once was in the past, such as during the Great Depression. Shadow stats has shown the numbers have been higher throughout this depression.
Bill Belichick learned to film signals of opponents from the former Chiefs, and Charger's coach Schottenheimer. Others like Edwards, Johnson and Cowher did too. They learned from the CHEATS and CHEATERS who still couldn't win.