Police have seized about 5kg of synthetic cannabis after searching a property in West Auckland.
The police raid took place yesterday morning in Glendene.
One woman has been arrested and charged with possession of psychoactive substances for supply.
The 48-year-old is scheduled to appear in the Waitakere District Court next week.
A police spokesperson said the search was a part of ongoing investigations to target those believed to be responsible for the manufacture and supply of illegal drugs, which include synthetic drugs.
"Police want to reiterate that we are actively targeting those responsible for the manufacture and supply of synthetic drugs and we will continue to hold those responsible to account.
"Anyone with information about illegal drug activity is urged to contact their local police station or contact Crimestoppers anonymously on 0800 555 111."