But nobody will. This is a common story in contractor arrangements---the big, unwritten benefit of the process is that all incentives are aligned to sweep small mistakes (1) under the rug. Contracting client doesn't want to jeopardize a good contract, contractee doesn't want to jeopardize their contract, and employee doesn't want to get fired and black-balled. Who cares if it's a little illegal? :(

(1) "Small" in relation to the whole contract deal; what's one employee's salary in a million-dollar agreement between two corporations?