The mayor of Wilmington, Del., knew something was wrong. After one year on the job, this former homicide cop had a hunch his police department had a leak. “The problems that we were having with this city with crime and information that got out too fast, my suspicion was always somebody might be involved in something,” said Mayor Dennis Williams to WDEL radio. But that is all it was, a hunch. And it stayed that way until last month, when city police found one of their own – a 911 dispatcher – allegedly giving her thug boyfriend a heads up...