Law Enforcement simply needs to get a memo from ICE as to what documents should be used as a standard. It would be a simle matter of establishing what documents will be considered as proof of legal citizenship here in the USA. I am sure once the law is set and active the documentation issue will be solved in a day. Law Enforcement data bases need to merge with ICE and E-Verify to speed up verification of ID and make it easier for Law Enforcement to do their jobs effectivly.