Northland has the highest rate of methamphetamine use and of the powerful opioid fentanyl in the country.

And a worker in the drug rehabilitation field in Northland says more rehab services and a greater awareness of them would help reduce the problem of methamphetamine - or P as it is also known - in the region.

A snapshot of the region's drug use has been released by police and Police Commissioner Mike Bush said authorities are continuing to build a clearer picture of New Zealand's drug use, with the first results of the National Wastewater Testing Programme.

Results are

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