Double jeopardy also does not apply if the later charge is civil rather than criminal in nature, which involves a different legal standard (crimes must be proven beyond a reasonable doubt, whereas civil wrongs need only be proven by preponderance of evidence or in some matters, clear and convincing evidence). Acquittal in a criminal case does not prevent the defendant from being the defendant in a civil suit relating to the same incident (though "res judicata" operates within the civil court system). For example, O. J. Simpson was acquitted of a double homicide in a California criminal prosecution, but lost a civil wrongful death claim brought over the same victims.