Crime is an inexcusable offence that may take different forms. For example, sedition, treason and espionage are crimes against the state where as murder, rape, kidnapping and assault are crimes against a person. Under criminal law, the government always files the suit where as in case of civil law a private party always files the suit.

Criminal law explains criminal offences and its elements and the punishment for the convicted offenders as an effective means of social control. The most important feature of the U.S. criminal law is its provision for common punishment. Certain criminal laws prescribe rules and regulations to observe and maintain higher standards of conduct. For example, helping the police in investigation when asked to do so and reporting to authorities immediately after a culprit is identified are examples of moral or ethical criminal laws.

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