penalties would be subject to this and probably limited to certain types of action, times of the game and/or perhaps certain parts of the field (i.e. inside 25 yd line). I think they can do it with the experience they have to give a chance to get a little more things correct. An example of the limitations would be for plays on players either with the ball or players making a play for the ball. Also, my opinion would be to only allow it in the last two minutes of the game since most other times I would argue one play doesn't make the game. Or another proposal would be only inside 25 yard line line of scrimmage. It would probably cut down on other challenges made in the first 3 minutes of the third quarter for example. Those challenges would be very precious.