State prosecutors from all 50 states are investigating the country's largest banks, to learn whether they have been foreclosing on thousands of Americans improperly. The banks say they do not seize people's houses without justification. But NPR has uncovered a case that might suggest otherwise. In fact, the homeowner in this case was actually the victim of a scam run by one of the bank's very own employees. But despite that, the bank moved to foreclose anyway.