There’s a sensor in the ball for that. I believe it sits centrally I’m the ball so the technology knows exactly, to the mm, where it needs to be.I an not sure of which technology they use when determining when a ball has crossed the goal line.
Whether that technology could be used would maybe be better for offside.
The problem with this is the cameras in use are awful. They should’ve had sky heavily involved with the 4000 frames per second thing or similar. Or they should say, when there are mms involved, that it’s on field decision which matters.
