Percy may have an opinion that Corby maybe innocent
BUT
he also states that NOT a lot of the evidence to support her defence is in an admissable form.
If the evidence for the defence is NOT admissable and there is reasonably strong and admissable evidence to support the prosecution. Most courts in most countries in the world are going to return a guilty verdict regardless of teary eyed pleads of "I did not do it"
Yes unfortunately this may result in a rare few not guilty people being convicted but it also prevents a far greater number of guilty people from getting off.