MINNEAPOLIS – The Hennepin County Sheriff’s Office is investigating the origin and impact of a contamination that may have impacted dozens of DNA samples at their lab. The Hennepin County Sheriff’s Office Forensic Science Laboratory (HCSO) halted all DNA analysis casework when the sporadic contamination was discovered, officials with the sheriff’s office said. There are at least 50,000 samples at the lab, of which 75 were potentially impacted.