Summit County is no longer conducting autopsies for three other counties as it grapples with a staffing shortage and a spike in drug-related deaths.The county — which did 755 full autopsies last year compared with 614 five years ago — has stopped handling cases for Columbiana, Richland and Wayne counties.The move was made because the workload has gotten too great and there is a worry about making a mistake in a delicate case, county medical examiner Dr.