If this story had been well written, I'd have liked the leads together very much. Sadly, it was not well written. I'm a scifi geek and I normally can suspend disbelief and don't care about the science, nor the premise, all that much. In this case, the way this story is written, a five year old child would question the test. I agree with other reviewers that the fact that none of the film's own characters question it strains the disbelief several steps too far, particularly considering how low tech this particular method of this trope is portrayed here. Since most of the characters appear miserable (agree with 'bleak world'), it's extremely depressing and drags on so badly. I cannot imagine a GOOD reason to watch this film. Further, if a large number of people watched it together, say in a theater, I would suggest putting the group on suicide watch.
Review of Fingernails
