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In 2005, police misconduct in New Orleans had reached an all-time high. In the weeks before and after Hurricane Katrina, several high-profile beatings and unjustified shootings by police led to intense federal scrutiny of the New Orleans Police Department (NOPD), including a 2010 U.S. Department of Justice investigation and a 2013 federal consent decree to overhaul policies and promote greater transparency and more civilian oversight of the police force.
In 2017, the NOPD aspires to serve as a model for how to reduce police misconduct. Rather than standing silently by—or joining in on a fellow officer's brutality—New Orleans
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In the shooting scene, you'd be able to collect the shell of the bullet and that would be one step to find out what type of gun the perpetrator used. You could go through nearby stores and look through their CCTV camera and find out what kind of car it was and maybe even catch a glimpse of the perpetrators face. However if the shooting was in a residential area you could go door to door looking for witnesses. To see if anybody heard or saw anything.