Bad call: technology's attack on referees and umpires and how to fix it

Good call or bad call, referees and umpires have always had the final say in sports.

Bad calls are more visible: plays are televised backward and forward and in slow motion.

New technologies - the Hawk-Eye system used in tennis and cricket, for example, and the goal-line technology used in English football - introduced to correct bad calls sometimes get it right and sometimes get it wrong, but always undermine the authority of referees and umpires. 'Bad Call' looks at the technologies used to make refereeing decisions in sports, analyses them in action, and explains the consequences.