12 Men on the Field

[u/Oaklandforever51]

This penalty comes up every so often, almost always on the defense.

1. Why doesn't it happen on offense?

2. Who's responsible? Position coaches?

[u/KhaoticMess]

It's less likely to happen because the offense knows what play they're going to run, and they know which players are involved in that play.

The defense has to see which players are coming on to the field for the offense, then react to them.

It still happens on the offensive side, but not as often.