The TMO helps the referee with certain reviewable moments, but the TMO does not replace the referee. What can be checked, and how far back the review can go, is controlled by the laws and protocols.
Because TMO protocols do not allow unlimited replay on every phase. Reviews stay within the parts of play the laws and competition rules allow officials to revisit.
This explainer uses the World Rugby Laws of the Game updated 1 July 2026. The Laws supply the underlying questions—such as grounding, touch, foul play, knock-on, or obstruction—while the competition's current television match official protocol controls what may be reviewed and how far back the officials may examine. A TMO practice seen in one tournament must not be treated as universal without naming that competition and protocol.
The referee remains responsible for the decision. Audio such as an on-field decision, a try-or-no-try question, or a request to check a specific act tells viewers how the review is framed, but the exact permitted process comes from the event protocol. If no clear and obvious evidence displaces the relevant starting decision, the officials apply that protocol rather than choosing the most popular camera angle.
For a possible try, for example, location in in-goal, possession, grounding, touch, and earlier infringement are distinct findings. For foul play, identity, act, danger, mitigation, and sanction are distinct findings. A broadcast may shorten the conversation, so a responsible explainer should say when the public audio does not establish why the protocol allowed or ended a check. The final referee signal remains the authoritative match decision when commentary and replay graphics disagree.