 After his trial, it was revealed that in 1989, Campbell had received a 12-month suspended sentence for forcibly detaining a 14-year-old girl in his house and taking indecent photographs of her.The use of text-message evidence in the trial led a group of researchers at the University of Leicester to begin studying text-messaging styles under the hypothesis that forensic research into the authorship analysis of such messages might help in future criminal cases.In 2004, Campbell was granted leave to appeal against his conviction on the grounds that evidence of his obsession with Jones, and of his interest in schoolgirls, should have been excluded at his trial and on the further grounds that one of the jurors, the next-door neighbour of a police officer involved in the case, should have been discharged.