Prisoners denied access to forensic evidence in bid to prove their innocence

Kevin Nunn, who was convicted of the murder of his former girlfriend in 2006, had his appeal to access evidence rejected by the supreme court in 2014. Photograph: Mimi Mollica/The Guardian

Prisoners convicted of serious crimes who may be the victims of miscarriages of justice are being blocked from access to crucial forensic information that could prove their innocence, experts have warned.

Campaigners are calling for legal reforms to provide improved access to evidence that may help prove the innocence of the wrongly convicted. They say a supreme court ruling in 2014 is effectively being used to deny access to police files and evidence.