It would not have to be retroactive. I don't believe that there weren't existing laws violated that could have been pursued. For instance, there's a documentary

It would not have to be retroactive. I don't believe that there weren't existing laws violated that could have been pursued. For instance, there's a documentary called "Small Enough To Jail" about Abacus bank - a small family run bank that was the only one to be prosecuted for mortgage fraud due to NINJA loans, although practically every bank was doing this at the time. That's just one example.