A GROUP of ex-internees known as the 'Hooded Men' say they believe they were given mind-altering drugs while in detention almost 45 years ago.
The 14 Catholic men claim they were tortured by members of the security forces after the introduction of internment in 1971.
Surviving members of the group are involved in a judicial review.
The latest claim came during a discussion involving the men in Lurgan, Co Armagh, at the weekend.
The event was organised to coincide with the first anniversary of the death of Gerry McKerr from Lurgan who was one of the group.
They say their treatment included being forced to listen to loud static noise and being deprived of sleep, food and water, as well as having to stand in stress positions and being beaten if they fell.
Some also claimed they were thrown from helicopters, which they were told were at sky height, while just feet from the ground.
In 1978 the European Court of Human Rights held that the British had carried out inhuman and degrading treatment - but fell short of making a finding of torture.
In 2014 the Irish government decided to ask the court to revise that judgment.
During the event the men recounted their experiences to an audience at Clan na Gael GAA club.
Liam Shannon said he believed some of the group were given the mind altering drug LSD which can cause hallucinations and flash backs.
“We have not made enough of the fact that drugs were used and were administered through the water,” he said.
It is understood that independent urine samples taken from the men around the time of their interrogation showed traces of LSD and other drugs.
Mr Shannon had earlier described the use of ‘white noise’ by his interrogators as “excruciating” and designed to 'drive them insane'.
Mr Shannon said that when the hood he was forced to wear was eventually removed from his head it was the most “scary experience of my life”.
“I didn’t recognise myself,” he said.
“The face starring back at me was not me.”
Mr Shannon and several of the other Hooded Men paid tribute to Monsignor Raymond Murray who was at the event, who has campaigned on behalf of the group since the 1970s.
The priest spoke about his time as a chaplain in Armagh Prison and read a poem he wrote about the experience of of one of the 'Hooded Men' Pat Shivers, from Toome in Co Antrim, who has since died.
