Provisions for such substances allow athletes to balance a reduced ban with the completion of a treatment programme. If he does not complete the programme, a ban of three months will apply.
Drug Free Sport New Zealand chief executive Nick Paterson said he supports this athlete-centred approach.
“We don’t believe that cannabis is performance-enhancing. Getting Mr Walker-Leawere Substance of Abuse support and back into sport after serving his sanction is the most practical outcome and supports long-term athlete health and wellbeing.
“We’ve advocated to remove cannabis from the Prohibited List for over 15 years and will continue to do so.
However, while cannabis remains on the Prohibited List, the best approach to avoiding a positive test is to avoid using it.”
Walker-Leawere was one of three players to return home early from an All Blacks XV tour to Japan last month.
At the time, New Zealand Rugby said Walker-Leawere, prop Oli Jager, and hooker Asafo Aumua had returned to New Zealand for personal reasons.