Football and rugby union are among the sports that use video technology to help determine contentious key decisions in matches.
Football uses a video assistant referee (VAR) while rugby union's equivalent has a television match official (TMO).
Both sports use the technology to intervene in key disputed decisions while trying to limit disruptions and maximise the flow of the match.
Decisions in football looked at by VAR officials are restricted to four main sets of incidents: possible red cards, possible penalties, goals and mistaken identity.
But the use of VAR has regularly split opinion since its introduction into football almost a decade ago. Earlier this month, Uefa referees' chief Roberto Rosetti said "we forgot the reason why VAR was introduced" and claimed it had become too "microscopic".
Similarly, TMO's main remit is checking try-scoring incidents, as well as reviewing goal-kicking success and any potential foul play.
Rugby union's use of video technology dates back much further than football, first trialled in the 1990s.
How is TMO used and what can football learn?
Given the fast-moving chaos of 30 players in close proximity to the ball and limited sightlines, it was perhaps inevitable that rugby would be an early adopter.
Initially television match officials were only used to help out with marginal calls on whether a try had been scored. England fans will remember and rue Mark Cueto's try being ruled out in the 2007 Rugby World Cup final against South Africa.
However its remit has expanded into incidents of foul play, and with the game's authorities leading a clampdown on high tackles, the conversations between the on-pitch officials and those seated in front of a screen have become longer and more frequent.
World Rugby have attempted to rein in trial-by-TV for every score, by guiding officials to only review incidents in the last couple of passages of play before a try, rather than spooling back further.
Limiting that creep and keeping the game flowing, while prioritising player safety, is the balance the game is trying to strike.
A 'bunker' system – whereby an incident which met the yellow card threshold could be upgraded to a red after a video review while the offender sat in the sin-bin – was introduced in 2023 and has been a success overall.
The system isn't perfect. South Africa's autumn win over Ireland in November lasted more than two hours once five yellow cards had been dissected and dished out over video review.
But the game is still faster and cleaner than it was before the introduction of video officials. And the transparent nature of decisions – with discussion between the officials broadcast live – is a definite advantage over football.
Why is VAR still causing issues?
Football was always resistant to using any kind of technology.
Only after Frank Lampard's 'ghost goal' against Germany at the 2010 World Cup did Fifa accept goal-line technology was needed.
Former president Sepp Blatter was steadfastly against trialling any form of video system. It was not until he departed the role in 2015 that the door was opened to VAR.
The Bundesliga and Serie A were the first leagues to introduce it in 2017-18 before it entered the laws of the game ahead of the 2018 World Cup.
It has been pretty well received when used in international tournaments, but it has proved increasingly problematic for leagues.
Achieving perceived consistency across a full league season has been a real problem, while VARs appear to have become ever more forensic.
This has fed into fan frustration about extended delays while VARs check decisions. Supporters inside stadiums are left with minimal information about what is happening.
The over-riding issue for football is that a lot of its laws are subjective.
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