Mens rea is more intention to do the act, not knowledge of criminality. For example intentionally killing someone is murder even if you didn't know murder is a

Mens rea is more intention to do the act, not knowledge of criminality. For example intentionally killing someone is murder even if you didn't know murder is a crime (because the act or killing was intended). The mens rea is intention to kill (if you lack the mens rea you end up with manslaughter or something equivalent).