Barry Harvey is wrong to suggest modern DNA evidence eradicates the possibility of miscarriages of justice (Opinion, July 26).
Like any other forensic evidence, mistakes can be made with DNA either by wrong interpretation of data or because of accidental or deliberate cross contamination of evidence.
Mr Harvey needs to remember Stefan Kiszko was convicted because police officers quite deliberately withheld forensic evidence showing it was impossible for him to have committed the crime. Officers who are capable of withholding this kind of evidence are capable of anything.
In my days as a police officer, I worked under a superintendent who openly admitted deliberately cross contaminating forensic evidence in order to gain some of his earlier convictions. I gave a statement of evidence against him following a high profile miscarriages of justice.
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