LOL gotta have rules. But to many bad calls when ball rolls down the line or see if it misses the foul pole or not. I think if the manager to take a look at it he can and if it shows ball is in play he will rule it a fair ball or a homer or an out because a fan reached in.But cannot be reviewed if a player makes a catch and looks like he traped the ball that cannot be reviewed cause its the umpires judgement.But ump is nowhere close to the foul poles or the outfield railing where the fans are to catch it in the stands.Thats where instant replay should take over.