I'm a bit late but have watched it now. Surprised there's not more discussion of it on here.
That police chap got very twitchy when asked why he didn't interview the accused men, didn't he? And why on EARTH was he allowed not to? Is there no boss reviewing the case, going 'Um, Detective, looks like something's slipped your mind...'?
And taking the woman into another room away from her parents and shutting the door 