Part 2 in a series on heroin’s effects on our community. Read Part 1. CEDAR RAPIDS — Heroin’s new hold into Cedar Rapids slipped in quietly, according to one emergency department doctor. UnityPoint Health-St. Luke’s Hospital’s emergency department already has treated more heroin overdoses during the first half of this year than in all of 2014 — 20 from January to June 2015 compared with 19 in 2014. It treated only nine in 2010. But Dr.