no, actus reus does not always involve a physical action. in some cases, failing to do something; omission, can be considered actus reus. for example, consider the case of parents who do not give their infant child enough food to eat. as a result, the child dies of malnutrition. under s. 215 (1) of the criminal code, the parents can be charged with failing to provide the child with the necessities of life.