Richard Lewis, executive chairman of the RFL, has authorised the extension of the drug-testing programme from 300 to 400 tests every year.
A statement from the RFL said the new measures take immediate effect and “players and clubs will be reminded of the consequences of drug abuse should the tests prove positive”.
“Rugby League has one of the most rigorous Doping Control regimes in British sport and only three other sports - soccer, athletics and rugby union - have bigger drug testing programmes,” said Lewis.
Players have even been tested by RFL representatives at overseas training camps, which this year included camps in Portugal, Spain and the US.
