Comment by dbcurtis

That "knowingly" part is more subtle than it sounds. A friend of mine managed a restaurant in Sili Valley for many years. He was required by law to accept workers' documentation at face value. He could get in trouble for accusing someone of using forged documents. So.... by the nature of his business he had constant turn over in dishwashers and bus staff, and hired a lot of staff with "correct", but obvious to the most casual observer, forged paperwork. All he could legally do is shrug and add them to the payroll.