If the person is a true "crook", then an investigation will turn up a whole lot more than just falsified credentials.
That's why the person's activities need to be scrutinzed at a more detailed level.
Most crooks keep offending, and do their best to cover their tracks.
I do believe that those who are truly wicked will be punished. The evil deeds done in the darkness will be ultimately brought into the light.
If you live where all of your deeds are done in the light of visibility and scrutiny, then you're accountable and your integrity will soon be evident.