Howard, one of the most prosperous counties in the nation, might seem to be immune to a scourge that is associated with blight and urban poverty, as seen in the TV mini-series "The Wire." But a growing trend here is clear. Last year, the county recorded 18 non-fatal overdoses. So far this year, the number is 14. As to heroin-related deaths in Howard, the count is five from 2013, eight in 2014 and seven so far this year.