corruption in the New Orleans Police Department

Question 1-  What do you think are the root causes of the corruption in the New Orleans Police Department and how did it exist for so long? 

Question 2- if you were appointed Chief of Police in New Orleans, how would you change the ethical culture in the department to address the corruption and prevent it in the future? 

 http://truecrimecases.blogspot.com/2012/08/the-desire-terrorist.html