This gets to the rub of prevailing wage. You are hiring a developer, do you call her an engineer where the prevailing wage is 87k or do you call her a programmer where the prevailing wage is 61k? This type of fraud is difficult to prove and there probably isn't even anyone responsible in the government to verify or investigate issues. EDIT: forgot to mention that the prevailing wage can be determined by salary survey…
[1] https://news.ycombinator.com/item?id=8687804 [2] https://news.ycombinator.com/item?id=8651850 [3] https://news.ycombinator.com/item?id=8637756