Scores of convictions in doubt amid forensic test manipulation claims

Criminal investigation of two staff at Randox lab may lead to appeals in many cases, including alleged rape and murder

Police fear scores of convictions may face challenges to their safety because of the suspected manipulation of forensic test results at a private laboratory in Manchester.

James Vaughan, the national police lead for forensic outsourcing, said two employees of the testing services company Randox were under criminal investigation for allegedly perverting the course of justice after issues with test results emerged in January.