The Detroit Free Press, in an eight-month long investigation, looks into a deadly disease outbreak that started from negligent behavior at a Michigan meat-packing plant. The outbreak of listeria killed at least 21 people and caused a multi-million dollar recall. The reporters used FOIA requests, interviewed sources across the country, and reviewed more than 10,000 pages of documents. The Free Press used a federal database of citations at U.S. meat plants, court and company records, e-mail traffic between federal and state health officers and state and county health records to complete this investigation. The investigation found that this meat-packing plant was similar to many plants across the nation.