actus reus and mens rea in criminal law
Actus reus Actus reus (/ˈæktəs ˈreɪəs/), sometimes called the external element or the objective element of a crime, is the Latin term for the "guilty act" which, when proved beyond a reasonable doubt in combination with the mens rea, "guilty mind", produces criminal liability in the common law-based criminal law jurisdictions of England and Wales, Canada, Australia, India, Pakistan, South Africa, New Zealand, Scotland, Nigeria, Ghana, Ireland, Israel and the United States of America. In the United States of America, some crimes also require proof of an attendant circumstance.
Omission (law) An omission is a failure to act, which generally attracts different legal consequences from positive conduct. In the criminal law, an omission will constitute an actus reus and give rise to liability only when the law imposes a duty to act and the defendant is in breach of that duty. In tort law, similarly, liability will be imposed for an omission only exceptionally, when it can be established that the defendant was under a duty to act.