When the NFL first reintroduced replay review 26 years ago, it started with a limited range of reviewable plays. Over time, the list of plays that could be corrected by replay review has expanded.

Here’s what typically happens. The officials make a “clear and obvious” mistake as to a play that doesn’t fall within the scope of reviewable plays, internal and/or external voices realize that the play should have been within the scope of reviewable plays all along, and the rules are expanded to encompass it.

Currently, the league is exploring further expansions to replay. Via Rob Maaddi of the Associated Press, potential additions include : “crackback blocks, low blocks/clipping, blindside blocks, intentional grounding (determine a receiver’s position on the field) and illegal formation o

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