Capitol riot investigator who launched probe details why bringing rioters to justice continues a year later: "There was no roadmap"

With more than 725 defendants, the January 6 assault on the U.S. Capitol, is the largest federal criminal investigation in U.S. history. 

Michael Sherwin, then the justice department's top prosecutor in the District of Columbia, helped launch the Capitol riots investigation.  

He told CBS News senior investigative correspondent Catherine Herridge that it was "important to move quickly to charge a good number of cases to instill in the public that the rule of law worked."