Mortgage brokers, mortgage agents, and mortgage lending

With all the different cases that I have read lately regarding mortgage fraud, is there the chance that some fall through the cracks. It does happen that sometimes they fall through the cracks. I read this article about this mortgage broker in Tacoma, Washington area filed a false second lien against a property as it was headed to closing. He planned literally to take advantage of a naïve couple and quietly pocket $24,000 into his own account when the loan eventually funded. Prosecuting cases take money. Do prosecutors let the case go or do they actively seek to go after these cases? I would recommend they go after them because too many people are being taken advantage of.