Four Northland retail outlets are facing action after police say they sold alcohol to minors in an sting operation.
Police have expressed disappointment at the results of controlled purchase operations (CPOs) at 18 licensed premises in the Bay of Islands and 19 in the Kaipara last week.
Volunteers aged 16 and 17 were sold alcohol at two locations in each district.
Alcohol harm prevention officer Constable Rasau Kalivati (Kerikeri) said he could not stress strongly enough that liquor licence holders should ask for identification if in doubt regarding a customer's age.
"If identification is produced, the seller must verify the correct age before making a sale. I do not expect that sales of alcohol should be occurring," he said.