It is often difficult to to gauge how effective drug treatment programmes are that receive public funding.
Yesterday, questions were asked to the Ministry of Health to which they responded by saying they give $187 million of taxpayer cash to 46 providers for services.
But they couldn't say how effective they were, or how often any lose funding for low performance.
Janet Thompson is chairperson of the Retreat NZ charity that offers 30 day rehabilitation programmes for people with alcohol or drug problems.
They've been doing it for eight years and have helped over 800 people.
They've just done a study and have a success rate better than the international average, but can't get any funding from the Ministry.
Janet Thompson told Mike Yardley their measure for success is quite clear.
“There’s a lot of different measures of success, but we judge success as clean and sober for 12 months or more."