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Pak'nSave Moorhouse will continue to use facial recognition technology.

Foodstuffs South Island is expanding its facial recognition technology to a fourth Christchurch store.

The supermarket giant says a trial from October last year to January was aimed at identifying and managing people with a history of serious and harmful in-store behaviour.

There were 531 confirmed matches with people of interest, with no one mis-identified and no false positives recorded.