Immigration Enforcement in Rhode Island

Here is an interesting story: http://www.bostonherald.com/news/opinion/op_ed/view/20100707bad_posture_on_amnesty_funny_how_feds_lean_on_ariz_not_ri/

Apparently Rhode Island has been practicing the same enforcement of illegal immigration that Arizona is attempting to do. I'm not sure whether RI has different legislation or if they simply enforce federal law, but they seem to have evaded federal scrutiny to this point. Something worth looking into...