LAPD 2009 assault audit
This 2009 LAPD audit found that 10% of the assaults reviewed were misclassified as minor incidents. At that error rate, the total number of serious assaults in the city during the six-month period covered by the audit would have been 32% higher than what was reported by the LAPD. The department did not publicly release the findings of this audit until 2011.
Sources: Los Angeles Police Department