Dozens of Police staff from across the South Island descended on a Gore address this week in a joint operation targeting the supply of drugs.
This operation was launched after Customs noted an increase in border interceptions of drugs destined for the region.
A quantity of methamphetamine and cannabis was seized, and one person faces drug supply charges.
On Wednesday, a 34-year-old woman was arrested in Gore with the help of the armed offenders squad.
She has been charged with possession for supply of methamphetamine and was due to appear in the Invercargill District Court on Friday.
Police said the operation continues with additional charges and arrests pending.
Police field crime manager Sean Cairns said the harm the methamphetamine was destined to cause was "immeasurable".
"I want to send a clear message to those dealing these illicit drugs that cause immeasurable harm in our community, we have dedicated staff who will continue to target, and hold you to account," he said in a statement.
"Our role is to minimise and prevent harm from occurring in our communities, to ensure everyone is safe and feels safe."
Customs investigations manager Dominic Adams said they were pleased to support police in the operation.
"Methamphetamine impacts many communities across New Zealand and we are focused on working closely with our partners to prevent this harm," he said.
Police said if anyone had any information regarding drug dealing to pass on anonymously, please contact Crime Stoppers 0800 555 111.
Help for addiction is also available on these free and confidential numbers:
• Alcohol & Drug Helpline 0800 787 797
• Narcotics Anonymous NZ 0800 628632
• 1737 - free text/phone to speak with a trained counsellor
• Youthline 0800 376 633
