In the investigative series, The Informant, two Star Tribune reporters uncovered corruption that was being done by Minneapolis cops.
As the article wrote, "The Star Tribune, through confidential police and court documents, has retraced the inner workings of that public corruption probe from its origins on the streets of Minneapolis in late 2006."
The reporters had to have strong knowledge of how to request police and court documents and how to find valuable information from them.
They received documents from the Minneapolis Police Department, the FBI, federal and state courts, and the offices of the Minneapolis city attorney, the Anoka County attorney and the Hennepin County sheriff.
Some examples of the types of documents they requested are transcripts of Minneapolis police internal affairs unit interviews with police officers and officials, and with an informant in the public corruption probe, an FBI report recounting the investigation and confession of a police officer who accepted money from an FBI informant, and a federal indictment of a police officer who confessed to taking money after providing confidential information to an informant.
There are many other sources they used but all of these reporting methods helped them to write a comprehensive and accurate story that began as an anonymous tip.