I hope to have more details on this later after digesting the 76 page decision but it seems SCOTUS has knocked out everything in the law that Civil Rights advocates attacked except for the stop and check of status.
Immigrants do not have to "carry registation papers"; the State Police cannot arrest allegedly illegal aliens without a warrant and they cannot get such a warrant from the state courts;and overturning the law which allowed the state to charge a misdemeanor against an undocumented alien from holding a job.
Even the "stop and check" portion of the law is in danger as the court invited civil rights advocates to bring other attacks against the law.
The majority has upheld federal exclusivity in setting and prosecuting Immigration policy. Interestingly both Kennedy and Chief Judge Roberts were in the majority.
More later I hope.
Hattip: The New York Times on Line