
Touchdown controversy —
NFL fans were in uproar earlier this week, when refereeing mistakes led to a last-minute touchdown by the Seattle Seahawks being awarded, giving the franchise a win over the Green Bay Packers. Top-level officials have been locked out of the NFL over a new collective bargaining agreement.

Lampard's lament —
Football has had numerous goalline controversies, leading to calls for the sport to adopt technology. Most notably at the 2010 World Cup, when England's Frank Lampard saw his "goal" disallowed in a match against Germany, despite the ball landing well over the line. The incident led to FIFA president Sepp Blatter admitting that the sport needed to embrace goalline technology.

Platini opposed —
But Blatter's European counterpart Michel Platini disagrees. The UEFA president would prefer football to expand the use of extra match officials.

Football's fix? —
Extra officials behind each goal have been used in football's Europa League since 2009 and five officials were used during the European Championships earlier this year.

Hawk-Eye —
Sports such as tennis, cricket and the codes of rugby union and league have also incorporated the use of technology to help officials make the correct decisions.