A woman has been arrested in connection a seizure of Class A drugs with a street value of approximately £6,000.
Police say a 46 year-old was detained coming off the overnight ferry from Aberdeen on Wednesday morning.
The woman remains in police custody and a report will be submitted to the procurator fiscal in Lerwick.
In the last week, in conjunction with Dogs Against Drugs, local officers are said to have intercepted Class A drugs worth a total of £12,000 which was destined for sale in the isles.
Chief Inspector Lindsay Tulloch said: “We will continue to make every effort to ensure Shetland is a risky and unsafe community for dealers to profit from the sale of illegal drugs.
“We need the community to help us and I would urge the public to phone in and report any information they have on people they suspect to be involved in selling and abusing controlled drugs.”