The moment when it is unclear if a ball has crossed the goal-line or not is an incredibly difficult call for officials to make. More often than not, mistakes are made.

With so many advancements in technology these controversies have led many to call for the use of "goal-line technology." The use of a replay system, such as Hawk-Eye or Cairos GLT, could do wonders to avoid errors of the human eye... (English Premier League, FA Cup, FIFA World Cup, French Ligue 1, German Bundesliga, International, Italian Serie A, Other Cups, Other Leagues, Spanish Primera Division, UEFA Champions League, UEFA Euro, UEFA Europa League)