Admittedly this is very little information, however there is not much in the article that is heartening. The oft cited statistic is that approximately 12M illegals are in the united states at present. Of that number the shocking fact is that an estimated 2/3rds arrived here legally. They had short term visas, etc. but simply did not return when they were supposed to. The INS, and now ICE, have not had the resources to track individuals once in the US on a proper Visa, no matter what the duration. I think it's fair to have concern that some may be coming to the US by the most efficient means possible - which could be to attend and AIDS conference, then blend into the community and not leave at the end of the temporary Visa, and then ride the back of the taxpayer for the approximate $25,000/year AIDS cocktail treatment.