In the closing stages of the Omagh bombing trial, a lawyer for the defendant, Sean Hoey, has said it would be a travesty of justice if he were to be convicted.
Defence lawyer Orlando Pownall argued that the DNA profiles allegedly matching Sean Hoey were unreliable and unscientific.
He said the prosecution case could not survive the taint of having witnesses beefing up their evidence, exhibits being interfered with, and one expert prosecution witness undermining the evidence of another.
Earlier, a prosecution lawyer at Belfast Crown Court argued that Mr Hoey had a case to answer.
Prosecution counsel Gordon Kerr said inference should be drawn from the fact Mr Hoey did not give evidence on his own behalf.
The closing defence submission will end tomorrow when Mr Justice Weir is expected to reserve judgment.
Sean Hoey, 37, from Jonesborough in south Armagh, has denied a total of 56 charges. These include 29 counts of murder in the Omagh bombing in August 1998.
The trial has heard from hundreds of witnesses and has lasted over 50 days.
Yesterday, the trial heard information from FBI spy David Rupert who had infiltrated dissident republican groups at the time of the Omagh attack.
In written evidence submitted by the defence and agreed by the prosecution, the court was told Mr Rupert had named to his handlers more than 100 members and associates of dissident republican groups. However, Mr Hoey was not one of them.
