The New Orleans Office of Inspector General released an audit which finds the New Orleans Police Department misclassified robberies.
Auditors reviewed data from June 2010 and May 2013, finding that the NOPD misclassified 37 percent of offenses as miscellaneous rather than robberies.
Also, auditors say officers did not report known robbery offenses when alleged victims refused to cooperate.
The OIG selected robbery for testing based on the FBI's 2012 published crime statistics which showed robbery in the city was 46 percent lower than other cities with the highest crime rates.
Former New Orleans Police Chief Ronal Serpas challenged the findings.
"This report does not appear to identify any real systemic failings or present evidence that more than a tiny fraction of UCR robbery incidents go unreported," said Serpas.