Actus Reus Definition:
Latin: a prohibited act.
Actus Reus Non Facit Reum Nisi Mens Sit Rea,
In R. v. Dial Oilfield Services, Judge Pahl adopted these words to define actus reus: at ¶14-15 of his January 2007 judgment:
"The wrongful deed that comprises the physical components of a crime (and) such result of human conduct as the law seeks to prevent.
"As seen in this light, we might ask what then is the physical result of human conduct the law seeks to prevent?"
For example, in Canada's Criminal Code, at s. 322, the actus reus of theft is defined as follows:
"Every one commits theft who fraudulently and without colour of right takes, or fraudulently and without colour of right converts to his use or to the use of another person, anything, whether animate or inanimate, with intent
actus reus is defined as an act but an omission can constitute one as well, such as at §215, failing "to provide necessaries of life for a child under the age of sixteen years".
(a) to deprive, temporarily or absolutely, the owner of it, or a person who has a special property or interest in it, of the thing or of his property or interest in it;
(b) to pledge it or deposit it as security;
(c) to part with it under a condition with respect to its return that the person who parts with it may be unable to perform; or
(d) to deal with it in such a manner that it cannot be restored in the condition in which it was at the time it was taken or converted."
During the normal course of a criminal trial, a prosecutor proves actus reus and mens rea beyond a reasonable doubt and barring a successful defence, conviction follows.
The term was judicially considered in R v Théroux where Justice McLachlin, in reference to the actus reus of fraud:
"The offence has two elements: dishonest act and deprivation. The dishonest act is established by proof of deceit, falsehood or 'other fraudulent means'. The the element of deprivation is established by proof of detriment, prejudice, or risk of prejudice to the economic interests of the victim, caused by the dishonest act."
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