Police are patrolling a quiet village amid concerns that criminals could try to unearth a huge stash of LSD said to have been secreted there four decades ago.
In 1977 police raided an old mansion in the village of Carno in west Wales and smashed a multimillion pound drugs operation said to have been supplying up to 90% of the LSD being used in the UK.
One of the detectives involved in the investigation, codenamed Operation Julie, is now claiming some of the stash may not have been found and may still be in pristine condition even after all these years.
Dyfed-Powys police are taking the claim seriously enough to warn villagers in Carno, near Llanidloes, that unwanted visitors may be on the way. They have told the owners of a house used as a drugs factory 40 years ago, Plas Llysyn, of the revelations and stepped up patrols in the area.
A police spokesperson said: “Dyfed-Powys police are aware of the issue and are assessing the content of the disclosure. We will be checking the records we hold to establish whether or not matters raised warrant further investigation.
Operation Julie was launched after one of the men at the centre of the drugs racket was involved in a car crash in the town of Machynlleth, west Wales. Police pieced together a torn-up note and found it mentioned a key ingredient of LSD.
Some 800 officers, some of them disguised as hippies seeking the good life, descended on west Wales. There were elements of farce to the saga. Some of the undercover officers had fights with local police to maintain their cover.