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In law, knowledge is one of the degrees of mens rea that constitute part of a crime. For example, in English law, the offence of knowingly being a passenger in a vehicle taken without consent (TWOC) requires that the prosecution prove not only that the defendant was a passenger in a vehicle and that it was taken by the driver without consent, but also that the defendant knew that it was taken without consent.cite-ref-1[1]

The mens rea of knowledge refers to knowledge about certain facts rather than "of the law is". It is "a positive belief that a state of affairs exists".cite-ref-2[2]

Knowledge can be actual, constructive, or imputed.cite-ref-3[3]

• Actual knowledge

• Constructive knowledge

• Imputed knowledge

• References

• Bibliography

A defendant does not have actual knowledge if they believe something to the contrary. The standard is subjective and the belief of the defendant need not be reasonable, only honest.cite-ref-h1-4-0[4] For example, in R v. Williamscite-ref-5[5] the defendant intervened in what he thought was a mugging but was in fact a citizen's arrest. His mistake was upheld as a defence against a charge of assault. In Beckford v. Rcite-ref-6[6] the defendant was a police officer who shot and killed V. Beckford claimed that he believed that V was shooting at him. It was found that the correct test was whether D "honestly believed" facts which, if true, would establish a defence. The reasonableness of the belief would be evidential in finding whether it was truly believed.

Knowledge is also found where a defendant suspects that circumstances exist and "deliberately decides not to make any further enquiries" in case his suspicions prove well founded.cite-ref-h1-4-1[4] A common example is a person who purchases significantly inexpensive and unprovenanced but desirable items from a stranger. Such a person is likely to be fixed with constructive knowledge that the items were stolen.cite-ref-7[7]

This is relevant in strict liability offences and in corporate crime. For example, if a bar manager delegates his duties to others and those others know of unlawful activities on the premises, the manager can be fixed with imputed knowledge of the unlawful activities.cite-ref-8[8]

cite-note-11. ↑ Theft Act 1968, s.12

cite-note-22. ↑ Herring (2004) p.170

cite-note-33. ↑ citerefgraves2024Graves, Charles Tait (2024). "Intentionality in Trade Secret Law". Berkeley Technology Law Journal. 39 (2): 721–781. doi:10.15779/Z38000018N – via Academic Search Complete.

cite-note-h1-44. ↑ Herring (2004) p.171

cite-note-55. ↑ [1987] 3 All ER 411, CA (England)

cite-note-66. ↑ [1987] 3 All ER 425, (UK Privy Council)

cite-note-77. ↑ Anderton v. Ryan [1985] AC 560, HL (England)

cite-note-88. ↑ Ferguson v. Weaving [1951] 1 All ER 412 (England)

• citerefherring-j-2004Herring, J. (2004). Criminal Law: Text, Cases, and Materials. Oxford: Oxford University Press. pp. 170–172. ISBN 0-19-876578-9.