As is typically the case, the DUmmies know absolutely nothing about criminal investigations. First, you develop enough probable cause for an arrest, then, once the arrest is made, you have to round up all the other players and get them interviewed. In an investigation such as this, once one investigator asks one question to the wrong guy, he sends up the flares to his cohorts. They scatter like rats, documents start getting shredded, emails deleted, and hard drives mysteriously come up missing. I can see no way to have completed this investigation prior to the arrest without tipping Blago off that he was about to get sacked-up.