However, he said “he did not see that there was a need to do any further work on the file” unless the case was brought to appeal, and then his focus would be on “bolstering” the case against Malkinson.
The police saw it as their job to make sure this particular person went to and stayed in prison regardless of what the evidence suggested. To that end, they purposefully ignored evidence that would eventually exonerate him. Fucking monsters.
District Attorneys are like "politicians", they've to have a very low ratio of wins vs lose to keep climbing the ladder. So, more often than not they'll bent over backwards to get the person in jail.