Scrum, ruck or maul pushed into in-goal - IRB Laws of Rugby Union 2012

Definitions
22.1

Grounding the ball
22.2

Picking up the ball
22.3

Ball grounded by an attacking player
22.4

Other ways to score a try
22.5

Ball grounded by a defending player
22.6

Scrum, ruck or maul pushed into in-goal
22.7

Restarting after a touch down
22.8

Ball kicked dead through in-goal
22.9

Defending player in in-goal
22.10

Ball held up in-goal
22.11

Ball dead in in-goal
22.12

Ball or player touching a flag or flag (corner) post
22.13

Attacking infringement with scrum sanction
22.14

Defending infringement with scrum sanction
22.15

Doubt about grounding
22.16

Infringements in in-goal
22.17

Misconduct or unfair play in in-goal

22.6 SCRUM, RUCK OR MAUL PUSHED INTO IN-GOAL

A scrum, ruck or maul can take place only in the field of play. As soon as a scrum, ruck or maul is pushed across the goal line, a player may legally ground the ball.This results in a touch down or try.