Actually, there is something called Statue of limitation in both civil and criminal cases. If a person is not accused within a certain time of an offence, he cannot be tried. Federal and nys limitation on robbery is actually 5 years, so if I rob a 7-11 and don’t get caught and charges aren’t filed within 5 years, I get away scott free.
As far as immigrants, I am all for legal immigrants, but if you don’t have your papers, bye bye.