Probe shows opioids arriving via mail from China. Reported by Amanda Garrett. As Summit County’s drug overdose numbers continued to hover around 25 or 26 per week in January, a yearlong U.S. Senate probe revealed what Akron narcotics detectives already knew: that fentanyl and carfentanil are coming here from China through the U.S. mail. Akron drug dealers have it shipped to nearby vacant houses, narcotics investigators have said.