Flags for the NFL's helmet rule have dropped significantly in Week 3 of the preseason, per ESPN Stats & Information. There have been nine calls in 14 games, with two left to play. That's an average of 0.64 per game. In Weeks 1 and 2, the average was 1.55 per game. The drop is not unexpected but is notable for its close proximity to a clarification issued last week to ensure that officials did not penalize inadvertent and incidental contact with a lowered helmet.