FYI

Rule 9 a 1

Dropped Goal. A player scores a dropped goal by kicking a goal from a drop kick in general play. The team awarded a free kick cannot score a dropped goal until the ball next becomes dead, or until an opponent has played or touched it, or has tackled the ball carrier. This restriction applies also to a scrum taken instead of a free kick.   

http://www.irblaws.com/EN/laws/3/9/85/during-the-match/method-of-scoring/points-values/#clause_85

HB Have this right