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 White paper on crime 2009 Part4/Chapter1/Section1/4 

4 Complicity cases

  Of 559,405 cases cleared (not including cases of juveniles of illegal behavior guided by the police and excluding cases in which an investigation confirmed that the act in question did not constitute a crime or that the conditions for prosecution or punishment were not satisfied; hereinafter the same in this subsection) for non-traffic penal code offenses (excluding dangerous driving causing death or injury pertaining to traffic accidents; hereinafter the same in this subsection) in 2008, 455,782 cases (81.5% ) were committed by a sole perpetrator and 103,623 cases (18.5%) were in complicity. The complicity rate (percentage of cases committed in complicity to total cases; hereinafter the same in this subsection) of cases involving juveniles only (cases committed by a sole juvenile perpetrator or in complicity with juveniles only) was 25.5%, higher than that of cases involving adults only (same as for juveniles) (16.3%) (Source: Criminal Statistics by National Police Agency).
  Table 4-1-1-9 shows the complicity rate of cleared cases for non-traffic penal code offenses involving juveniles only by type of offense.
  The complicity rate of cleared cases for non-traffic penal code offenses involving juveniles only was the highest for robbery at 56.9%, followed by extortion at 54.5%, and injury at 31.2%, all much higher than those involving adults only (robbery 16.6%, extortion 32.8%, and injury 10.2%). In addition, the percentage of cases involving juveniles only committed by 4 or more perpetrators was considerably high for robbery at 16.6%, extortion at 9.3%, and injury at 8.7%.

Table 4-1-1-9  Compl icity rate of cleared cases for non-traffic penal code offenses involving juveni les only by type of offense (2008)