A 2008 study by University of Chicago law professor Craig B. Futterman found 10,000 complaints filed against Chicago police officers between 2002 and 2004. That's more than any city in the country, and proportionally it's 40 percent above the national average. Of those 10,000 complaints, just 19resulted in significant disciplinary action. In 85 percent of the cases, the complaint was dismissed without even interviewing the accused officer. The study also found that about 5 percent of the department's 13,500 officers accounted for more than half the complaints.