Fault, as a legal term, refers to legal blameworthiness and responsibility in each area of law. It refers to both the actus reus and the mental state of the defendant. The basic principle is that a defendant should be able to contemplate the harm that his actions may cause, and therefore should aim to avoid such actions. Different forms of liability employ different notions of fault, in some there is no need to prove fault, but the absence of it. In criminal law, the mens rea is used to decide if the defendant has criminal intent when he commits the act and, if so, he is therefore liable for the crime. However, this is not necessary for strict liability offences, where no particular state of mind is required to satisfy the burden of proof. Actus reus element Most requirements for a successful actus reus require a voluntary act, or omission, for evidence of fault. There is also a requirement for a clear causation, there is no liability or fault if the defendant was not actually the sole cause of the act, this is so if there was an intervention of a third party, an unexpected natural event, or the victim's own act. Either of these can remove the legal blame from the defendant and remove the fault. Automatism If the criminal act is caused by an act of automatism, it means the act was caused by an involuntary movement of the limbs, and not controlled by neuron stimulation, removing the blameworthiness from the defendant. This was seen in the case of Hill V. Baxter (1958) where the defendant injured a person by crashing his car into them. He argued that his action was not voluntary because he was unaware of what happened. However, he was found guilty because the judge held that sleepiness or drowsiness when driving does not amount to automatism. Duress In the case of duress, the defendant has committed the act in response to a threat of death or serious personal injury to himself or a loved one, or someone towards whom he feels responsible. Therefore he is removed of fault as his actions were done to prevent such harm being done. It would be considered unfair to place the defendant at fault of a criminal action which he committed under duress. Liability In such cases of a "state-of-affairs" crimes, the defendant may be found liable even