By CAITLIN McARTHUR
LANSING — Heroin and related drugs are spreading across Michigan and have become more deadly in recent years, some experts say. Michigan-wide numbers of unintentional overdose deaths have quadrupled since 1999, according to a Department of Community Health (DCH) report. Meanwhile, the number of deaths due to other drugs such as cocaine has gone down, according the report. Genesee, Macomb and Wayne Counties account for the highest recent heroin and opioid-related death rates, according to the DCH. But the problem is creeping into other areas: DCH data shows Antrim, Manistee, Clare, Hillsdale and Cass counties all recorded opioid-related overdose rates higher than the state average between 2009 and 2012.