David and Karen Longstreet of Lexington, whose daughter Emma was killed last year by a drunken driver in a traffic wreck, lobbies lawmakers Tuesday for a bill that would require vehicle ignition interlocks in more cases in effort to reduce DUI. The Longstreets carry a photograph of their Emma who was six-years-old when she was killed. KIM KIM FOSTER-TOBIN — kkfoster@thestate.com Buy Photo