Planning a crime in one's head can be a crime in and of itself because it establishes mens rea.

Name: Planning a crime in one's head can be a crime in and of itself because it establishes mens rea.
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Question

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Merely planning a crime in one's head does not constitute a crime because there is no actus reus (physical act) to accompany the mens rea (mental intent). For a crime to be prosecutable, there typically needs to be some outward act or manifestation of the intent to commit the crime.

Planning a Crime in One's Head Can Be a Crime