Most criminal offences require the prosecution to establish beyond all reasonable doubt that the accused has committed a criminal action and that this was committed with intent
Sanctions against deviance are informal and can include parents grounding their children, people disapproving and ignoring you or labelling behaviour and a group of people as delinquents
The MAOA gene causes a deficiency in monoamine oxidase A, an enzyme responsible for the metabolism of neurotransmitters such as serotonin, which has links to aggression
Adoption studies show a significant correlation between the number of criminal convictions of biological parents and their offspring, but not with adopted parents
Damage to the prefrontal cortex of the brain may cause individuals to have an altered behaviour pattern, making them more impulsive and less self-controlled
Low levels of serotonin are linked to higher aggression