White paper on crime 2011 Part4/Chapter5/Section2/1
The number of suspects (limited to non-traffic penal code offenses and special act offenses excluding violation of road traffic related acts) not prosecuted in public prosecutors offices due to insanity was 523 in 2010 (See Table 2-2-3-3). In addition, two persons were also found not guilty on the grounds of insanity in a court of first instance in 2010 (Source: The General Secretariat, Supreme Court).