Drug Free Sport NZ backed the decision by the UK Anti-Doping agency to prevent the Kiwis using a synthetic steroid on injured utility Thomas Leuluai.
It is entirely academic now, with Leuluai ruled out for the rest of the tournament, but the New Zealand camp had hoped to circumnavigate the UKAD decision to prohibit the use of prednisone by getting approval from Drug Free Sport NZ.
There were no guarantees they would have been able to use it on Leuluai even if Drug Free Sport NZ had given their approval because UKAD are contracted by Rugby League World Cup 2013 for the duration of the tournament. Drug Free Sport NZ ruled over the weekend that they were "obliged" to follow UKAD's decision, according to a Kiwis spokesman.
Leuluai's World Cup lasted less than five minutes when it was apparent his groin injury wasn't up to playing when he attempted to take the field against Papua New Guinea on Saturday morning (NZT).
The 28-year-old will remain with the Kiwis for the rest of the tournament and, as a member of the senior leadership group and with eight years' experience playing in the UK, has played an important role off the field. The Warriors are happy for him to stay in the UK, especially as most of the club's medical team are with the Kiwis.