why have liners at all? Goal line tech can be applied to the extent of play lines, there can be a sensor in the ball to determine exactly when it is kicked, and each player can be made to wear a transponder, as many already do, if the transponder is in the same place for everyone, it should be easy for software to interpret where the players are exactly when the ball is kicked. On field discipline can be enforced by video monitors who ask the ref to look fat anything contentious. That is how to apply technology, not to get some halfwit wh knows the rules of football but not the game.