structural:reformatting
Levels of mens rea within the United States

Under the tradition of common law, judges would often require a "bad state of mind" in addition to an action or omission (actus reus) to find a criminal guilty. Over time, culpable mental states (mens rea) became varied among different types of crimes. Such crimes and mental states might include, for example, "malice" for murder, "fraudulence" for fraud, "willfulness and corruption" for perjury, and so on. The crime of manslaughter, further, might not even require a "bad mind" but simply a "negligent" one. Regardless of how the requirements are categorized, the Supreme Court has explained mens rea requirements for crimes are "universal" and essential to "mature systems of law", even going so far as to say that this belief undergirds notions of free will and morality.