The Obama administration’s Residential MBS Working Group, set up in January to probe misconduct that drove the financial crisis, is apparently trying to tap the Financial Institutions Reform, Recovery, and Enforcement Act of 1989 to make such cases easier to bring. Although it hasn’t been used that much, the appeal of pursuing criminal investigations under FIRREA is apparently the relatively lower burden of proof than bringing more traditional criminal charges. Also, FIRREA has a longer statute of limitations than do other finance-related laws, along with the potential for large fines...