Your browser does not support the iframe HTML tag. Try viewing this in a modern browser like Chrome, Safari, Firefox or Internet Explorer 9 or later. WASHINGTON — A Missouri grand jury’s decision to spare police officer Darren Wilson from criminal charges is the latest in a long line of police shooting investigations that show the latitude afforded law enforcement in using deadly force. The question for the panel that decided the case was never whether Wilson fatally shot 18-year-old …