biological explanations are reductionist attempting to reduce complex behaviour down to the actions of chemicals and cells
they underestimate the role of environmental factors
e.g. Ministry of Justice 2012 found that 29% of offenders suffered from some form of child abuse, 41% had witnessed violence at home
biological explanations are deterministic, suggesting that criminal behaviour is predetermined by biological processes
there are therefore important implications for the issue of criminal responsibility. the criminal justice system assumes that criminals are responsible for their behaviour and therefore deserving of punishment