Three businesses are being reported to the procurator fiscal after allegedly selling alcohol to children.
One organisation in Scalloway and two in Lerwick failed a recent test purchasing operation staged by police. The businesses in question have not been named.
Test purchasing powers are used by the police to root out any licensed traders who sell alcohol to minors, adding to alcohol related problems such as anti-social behaviour, disorder and vandalism.
The test purchasing scheme consists of a fully briefed teenager (under the age of 18) entering licensed premises under controlled conditions.
If the proprietor does not ask the person their age and allows them to buy drink they will be committing an offence, even if their excuse is that they thought they were 18.
Police insist licence holders will not be duped into committing an offence because if they ask the age of the test purchaser, as they should do, the youngsters will answer truthfully.
Public houses, off-sales and nightclub proprietors are reminded they could face losing their licence if they are found to be selling alcohol to anyone under 18.
The police-led initiative is being supported by Highland Council, Orkney Islands Council, the Crown Office and the Procurator Fiscal Service, Licenced Trade Association and Crimestoppers.