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The remains of Mark Corley, 23, from Walton, Gardens, Grantham were found on remote farmland near Darlington, in December 2000.
Five men were charged with murder but the case was dropped when it emerged police had illegally recorded evidence.
A trial began at Nottingham Crown Court in 2002 which heard Mark Corley had been “executed by a brutal shooting”.
But Mr Justice Newman discharged five men accused of his murder when the court was told Lincolnshire Police had installed hidden microphones in exercise yards outside cells at Sleaford and Grantham police stations.
Prisoners and their solicitors, who were not allowed to smoke in interview rooms, went out into the yards and their privileged conversations were recorded.