To do that, you need to actually convict the employer of a crime...
...and juries, by and large, refuse to do that.
...and juries, by and large, refuse to do that.
Do you have examples of that?
Can you provide a link to jury trials where employers were tried for an offence related to employment of illegal aliens and were acquited? I'll be shocked if there are more than two or three over the entire ten year or so period throughly covered by google indexing.
The real story is that they almost always get slap on the wrist fines and there is no trial. Pass a law with reasonable employer sanctions -- say, a month in prison for a first offence -- and jurors will usually convict. And your average office manager for a small business is NOT going to want to risk that month locked up in prison with you know what kinds of people. This would be a terrific deterent even if there were a fair number of acquitals, which I question.
A lot of murderers get acquited, but you don't want prosecutors to ignore that also, do you?