The vast majority of illegal immigrants I've know have proper legal documentation. They purchase birth certificates, SS numbers, etc. of legal citizens, and then obtain a driver's license. It is obviously a black market scheme, and when I ran one's SS number at work it showed up that he died in 1992, and another had his wages garnished for alimony to a woman he never met. In my limited experience, this appears to be a major problem, as illegals assume identities of legals for years, but what laws are there to enforce against this?