Jailhouse snitches used too often: private investigator

A former police officer turned private investigator, whose work on the Teina Pora case was instrumental in his conviction being quashed, says the police use of jailhouse snitches is on the rise - and is deeply concerning. A prisoner who gave evidence against David Tamihere, convincted in 1990 for the murders of two Swedish tourists, has now been identified as Roberto Harris - himself a convicted double murderer - who changed his story after the trial. Tim McKinell says police use jailhouse informants too often and their reliability and credibility need to be carefully examined.