For years, the department contracted with Metropolitan Towing to take vehicles seized during arrests. If unclaimed, the firm sold the vehicles through a subsidiary.
Police admitted the firm allowed many officers to borrow vehicles, sometimes for weeks or months at a time. Authorities also say Mokwa's daughter, Aimee Mokwa Goodrich, was also allowed to drive the cars and bought three at discounted prices.
The FBI would provide many details about its investigation, but the agency is asking people who have had their cars towed or held by the company in the last five years to fill out an on-line survey at stlouis.fbi.gov. Those affected may also contact the FBI by phone at 1-800-225-5324.© Copyright 2016, St. Louis Public Radio