An anti-drug group says the public shouldn't be funding pamphlets on how to safely use methamphetamine.

New Zealand's approach to drug education's been thrust into the spotlight, after some Massey High School students were given a "harm minimisation" document as part of a health study.

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The leaflet includes information on how to clean meth pipes, and recommends users never carry more than five grams of the drug.

Methcon managing director Dale Kirk told Mike Hosking it is beyond belief.

"If you're a parent you have got to ask yourself are you happy this information a. is being presented at school and b. that your tax payer money is funding it."

LISTEN ABOVE AS DALE KIRK SPEAKS WITH MIKE HOSKING