one more reason this is coming up now is because of the labor being processed faster. if we go back before PERM is/was implemented/enforced .. labor took more than year or even 2 years.. (state and regional) .. and by that time all record of illegal work in W2 would not be in the submitted tax return hence it was never a problem. now since labor is getting cleared in as fast as 2 weeks.... it might b more relevant, common and wide spread now.