[bayourod]

"several people I know, who aren't illegals, have second jobs where they are paid off the books"

Are they "employees" or "independent contractors"? If they are employees, they and their employers are committing criminal offenses much more serious than being an undocumented laborer.

[oceanview]

well of course its "illegal", but its still a routine thing, even for legal residents/citizens, and more so for illegals.