In the future, all mental Illness is illegal. After a teen’s girlfriend is taken away due to early detection of a mental defect, he searches to find an error with the brain scanning machine but uncovers a dark secret.

Sorry for any confusion in that post - the first use of 'goal' should be trigger. Need to proofread...

Understand the premise, the goal and the challenge, but there isn't a clear goal - Why does this dark secret matter to him, her or society? Tell us why the dark secret must remain a secret, or what will happen if the info is made public.

What Nir Shelter said. ?What become his objective goal when he finds the error? ?What must he do about it?