A medical incident earlier in November prompted some questions about how frequently overdoses are happening in Nashville’s jails. So far in 2018, medical staff have responded to, and used Narcan in, a total of 29 cases within Davidson County Jails – once every 12 days, on average. On what was an otherwise normal Friday morning at 7 A.M. in the D1 housing unit inside a Nashville jail, which houses 61 inmates in an open barracks style unit, there was a sudden medical emergency with an inmate. 32-year-old James Livingston, who…