Grounds controlled by Association units shall not be used or permitted to be used, for horse racing, greyhound racing, or for field games other than those sanctioned by Central Council.
— Rule 42, GAA rule book
While this wording remains as the current Rule 5.1(b), a footnote now reads:
(Note: Central Council shall have the power to authorise the use of Croke Park for games other than those controlled by the Association.)
— Rule 5.1(b), Official Guide
In practice the rule was only applied to the sports of soccer and rugby, which were perceived to be rivals to the playing of Gaelic games.Cricket was also banned, but Croke Park is too small for a cricket field. As such, several games of American football have been played with rule 42 in force, as well as a boxing match and a baseball game. The rule was officially relaxed in 2005 for the duration of the reconstruction of Lansdowne Road, to allow for the playing of Republic of Ireland soccer and Irish rugby internationals. The Republic of Ireland soccer and Ireland rugby internationals moved into the new Aviva Stadium on the former Lansdowne Road site upon its opening in May 2010; the last international in either sport at Croke Park was the rugby team's 2010 Six Nations home fixture with Scotland on 20 March.