ON THE BALL?

A match involving a Brigg football team had an incident similar to the infamous one in the recent clash between Reading and Watford, when the officials gave a goal although TV footage showed the ball had gone the wrong side of the post.
In the case of the Briggensians' FC match, some thought the ball had gone into the goal but then crept through a hole in the netting, giving the impression it might have gone wide of the post.
In this case, after some delay, the 'goal' was ruled out.
In cricket, if there's any doubt, the umpires give the benefit of the doubt to the batsman, and say 'not out'. Maybe there's some unwritten law in football along the same lines, in favour of the defending team.
Clearly, in both sports, officials can't give what they didn't see. Even if the players and officials think they ought to have seen it.