It is 2015.
Gangs of youths on deprived estates no longer pose a threat to passers-by.
Liam, a Leeds schoolboy, is identified as possessing a biological predisposition for violent behaviour.
Once the biological "markers" are recognised, the boy is apprehended for treatment before he commits any crime.
But there are ethical dangers with the pre-emptive strike - and it has an impact on Liam's whole family.
Scientists in the US and UK are building a body of evidence that the nurture-versus-nature debate is far too simple.
Brain damage, the structure of the pre-frontal lobe, and levels of enzymes and neurotransmitters like Serotonin have all been cited as indicators of a predisposition to violent or antisocial behaviour.
Increasingly, arguments are made that the social conditions associated with crime today - abuse, neglect, poverty - can activate a biological predisposition for violence.
Identify that predisposition, and the pre-emptive strike becomes a possibility.
The programme talked to the leading proponents on the cutting edge of this controversial science and explores their theories. (Quelle: BBC)