On 29 August 1990, as a result of further fresh evidence uncovered following the 1988 dismissal of appeal, the Home Secretary again referred the convictions of the Birmingham Six to the Court of Appeal. This appeal was heard by Lord Justice Lloyd between 4 and 14 March 1991. At the conclusion of this second appeal, the convictions of the Birmingham Six were quashed upon the bases of police fabrication of evidence, the suppression of evidence, and the unreliability of the scientific evidence presented at their 1975 trial. The tests conducted by Skuse upon the defendants' hands for nitroglycerine were deemed by the three Court of Appeal judges as being particularly unreliable and "demonstrably wrong ... even by the state of forensic science in 1974".