Death In Custody Edit Meaning

1.

What happens to black people after they've been arrested by the metropolitan police but even when an inquest records a verdict of unlawful killing, no policemen are ever convicted (because criminal charges are assesed based on evidence gathered by, you've guessed it...the police!)

'sarge, I just beat a nigger to death in the cells. But he had it coming, he was giving me lip. Or he would have done if I hadn't hit him first, you know what they are like'

'don't worry son, I'll have to gather the evidence myself and of course i won't find any *wink wink* and of course there were no witnesses in this busy police station were there'