Reporters from the Chattanooga Times Free Press pored over hundreds of court documents and conducted more than 150 interviews for a special report, "Speak No Evil."  The report examined about 300 shootings in Chattanooga.  Often, after a shooting, no one is arrested—even if witnesses saw it happen.  If a shooter is arrested and prosecuted, he or she may spent only a short time in prison.  That’s because witnesses are often unwilling to cooperate with police.