The NFL says it found no credible evidence that Peyton Manning was provided with human growth hormone or other prohibited substances as alleged in a documentary by Al-Jazeera America last year. The NFL is continuing its investigation into allegations made against other NFL players in the documentary, which the league said involves ''different lines of inquiry and witnesses.'' Those other players - all of them linebackers - provided the league with sworn affidavits, but the NFL wants to interview them in person. In stark contrast, Manning, who retired a month after Denver's 24-10 win over Carolina in Super Bowl 50, welcomed the probe. More...