More than 7,000 players have undertaken mandatory anti-doping training, World Rugby has revealed.
Over half of the players have completed an online course, while another 3,300 have received classroom training.
The 2015 Rugby World Cup will feature a "Keep Rugby Clean" day on 26 September.
World Rugby chairman Bernard Lapasset said: "As rugby continues to grow and thrive around the world, it is essential to educate all involved in the game that there are no short-cuts."
In 2013, 1,831 in and out-of-competition tests had been taken.
Players participating in the Sevens World Series and World Rugby Women's Sevens Series, World Rugby U20 tournaments and World Rugby regional 15s, sevens and age-grade events are yet to undertake mandatory education.