The prosecution had called expert witnesses at the trial whose evidence suggested that it was likely that the particle of FDR came from a gun fired by Barry George rather than from some other source. A forensic scientist interviewed in a BBC documentary on the case, broadcast in 2019 stated that potentially one in a hundred people could have gunshot residue on their clothing, picked up from someone else, possibly a hobby shooter or armed police officer. Those witnesses and other witnesses from the Forensic Science Service told the Court of Appeal that this was not the right conclusion to draw from the discovery of the particle of FDR. It was instead no more likely that the particle had come from a gun fired by Barry George than that it had come from some other source. The Court of Appeal concluded that, if this evidence had been given to the jury at the trial, there was no certainty that the jury would have found George guilty. For this reason his conviction had to be quashed. A retrial was ordered and George was remanded in custody, making no application for bail.