A warning New Zealand's meth crisis will continue to spiral if the demand isn't dealt with

Wastewater testing data shows that methamphetamine consumption has doubled in the last year.

Drug Foundation Executive Director Sarah Helm says the increase comes in spite of record-breaking seizures by Police and Customs.

Helm says if people have addictions, they'll just get their product from someone else after a drug bust or seizure, so we need more services treating the addiction.