The Putnam County Sheriff, Carmel Police Acting Chief and Kent Police Chief say their agencies are participating in a special enforcement effort to crack down on impaired driving this Halloween.  When it comes to drunk driving, Sheriff Robert Langley says Halloween can turn the roads into a horror fest.  The statewide STOP-DWI Crackdown efforts started last night and will end on Sunday. Research shows that high visibility enforcement can reduce impaired driving fatalities by as much as 20 percent.