NFL owners to consider rule that makes roughing the passer penalties reviewable
Should coaches be able to challenge penalties? : r/nfl
Evolved Bats : r/ClashRoyale
NFL challenge rules: What can a coach challenge (and not)?
Which XFL rules should the NFL consider stealing? - ESPN
Can you challenge pass interference in the NFL? Replay rules and more about OPI, DPI in 2020
Coach's challenge could be a timely tool for teams to wield
Which XFL rules should the NFL consider stealing? - ESPN
One rule proposal would let coaches challenge uncalled penalties in replay : r/nfl
NFL playoff officiating decisions - What happened on controversial calls -- right and wrong -- and what came next - ESPN
Pass interference in football makes no sense to me. Isn't the whole point to interfere with the success of the opposing team? - Quora