the league's power and cut red tape, allowing the AFL to gain control of the Laws of the Game (forming the official AFL Rules Committee). With control over the laws of the game, the AFL began a rush of new rules, many of which were aimed at cleaning up the game, reducing "thuggery" and making it more attractive to spectators. A player tribunal system was introduced to more effectively deliver penalties. The blood rule was introduced (players must be removed from ground when bleeding, also when having blood on their body/playing uniforms) to protect players from the transmission of blood-borne disease. The sin bin rule was discarded in favour of player reports and the allocation of free kicks against the aggrieved side. In 1994, the AFL turned its focus to speeding up the game. To do this, the league increased the number of interchange players for their matches from 2 to 3 and increased the number of field umpires in the AFL from 2 to 3. In 1998, the number of interchange players for AFL matches was increased from 3 to 4 to further speed up the game. The league began using its pre-season competition as a test-bed for experimental new rules. In 2003, the AFL forced the dissolution of the International Australian Football Council (formed in 1995) to become world governing body for the sport and in 1994 released its first official International Policy. In 2005, the centre circle was introduced for ruck contests, in response to an increasing number of posterior cruciate ligament injuries among ruckmen. In 2006, the AFL announced its intention to further speed up the game and reduce stoppages with the aim of enhancing the game as a spectacle, particularly aimed at television audiences. It introduced a time limit for set shots, which was thought by some to be in response to players such as Matthew Lloyd and Brendan Fevola taking up to a minute to prepare for kicking their goals. The AFL made more stringent the interpretation of awarding penalties for "scragging" (attempting to deliberately hold play up by grabbing the opposition player after they had taken a mark). Finally, the league made it unnecessary for players to wait for the flag waved after a behind to kick the ball back into play, and introduced a bucket of spare balls behind each goal to avoid the need to wait for the crowd to return