Drug checking services are available at Auckland stadiums for the first time from today, following a law change last year.

Volunteers from KnowYourStuff NZ will be at Mt Smart Stadium's music concert "Listen In".

A report for the 2021 to 2022 festival season shows samples have been tested at 40 events, nearly twice the number done two years ago.

Auckland Stadiums Director, James Parkinson told Kate Hawkesby says it's a new tool to keep people safe, made available by the legalisation of drug checking.

He says it's natural to add it to their other security and safety measures.

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