Chicago police arrest a suspect on June 5, 2012. The Chicago Police Department narcotics division has been conducting undercover investigations in order to move in on suspected drug dealers in parts of Chicago's South and West sides. (AP Photo/Robert Ray)

Photo by: Robert Ray

Chicago police arrest a suspect on June 5, 2012. The Chicago Police Department narcotics division has been conducting undercover investigations in order to move in on suspected drug dealers in parts of Chicago's South and West sides. (AP Photo/Robert Ray)