The nation was eagerly awaiting the Supreme Court decision on the Affordable Care Act, which did not come today, but still shined a brighter light the other important decisions that were released today.
In the biggest ruling of the day, the Court ruled 5-3 in favor of the federal government in its lawsuit with Arizona over its controversial immigration law. (Justice Elena Kagan recused herself from the case.) However, it was a mixed decision that invalidated most of the law, but upheld a key provision that allows police officers to the check the immigration status of people they have already arrested.
Three of the other four provisions in Arizona's law were "preempted," which means that the Court determined that federal immigration law trumps the state law. However, the court ruled that allowing local police to check the immigration status of detainees would not necessarily interfere with federal enforcement of immigration laws. (Though if it does, that aspect could be challenged in court at a later time.) It's a complicated split decision that legal experts will be parsing for some time. You can download and read the ruling from the Supreme Court's website, if you're so inclined.