I can't quote or link to any articles but I would like to add what I heard on the radio a couple days ago regarding the topic at hand. As I understand it, there are currently undocumented immigrants currently taking advantage of Medicaid. It is also likely to continue. The system was initially structured to require proof of citizenship. When the rubber hit the road, it was learned that there are a large number of people who cannot prrove their citizenship. Sadly, the reality of the situation is the people who need the program most are elderly infirmed and not surprisingly there are many elderly infirmed who have no proof of their citizenship and no way to (realistically) obtain that proof. After several deaths of people who were denied care because they could not proove they were U.S. citizens, the regulation was relaxed. Naturally, there are always going to be people who will bilk any system they can for as much as they can.