First - let us talk very briefly about health care. The federal health care reform aka Obamacare. Guess what? It is not actually a federal health insurance. It's actually a mandatory state health insurance law - just like mandatory car insurance which is not a federal law. Massachusetts as a state is allowed to regulate medical practice and establish standards of medical care.
Now - let us talk about immigration laws. It is federal responsibility to protect the international borders and it is the state responsibility to protect its internal affair. The illegals are illegally entering America as a nation - thru international border, not state.... hence the responsibility lays on federal government to catch them and deport them back. For many decades, the Supreme Court has repeatedly granted Congress and federal government with broad & exclusive authority over immigration/naturalization/deportation... therefore enacting the state law attempting to regulate immigration law that is different from federal immigration law or superseded federal immigration law is a violation of Supremacy Clause of the Constitution. However - because the immigration stuff is nowhere written in the Constitution - the state laws preempted the federal laws which means the state can enact state immigration law as long as it doesn't violate federal laws.
California's Proposition 187 was ruled unconstitutional because California attempted to DIRECTLY regulate immigration itself.... which is federal responsibility. and also few other things such as denying education and public service to illegal aliens and their children.. which is a violation of federal law.
A city in Texas called Farmers Branch enacted an ordinance that requires landlords to perform immigration status check on those who wants to rent from them. This was found unconstitutional as they attempted to DIRECTLY regulate immigration itself without deferring it to federal government.
There was a proposal called
CLEAR Act back in 2003 (Clear Law Enforcement for Criminal Alien Removal Act of 2003) authored by late House Rep. Charles Norwood of Georgia. It would compel the state/local polices to enforce federal immigration law otherwise the state/town will not be federally reimbursed for any expenses related to illegal aliens. This bill was not popular and it did not pass. I believe this bill is a clear violation of 10th Amendment as the federal government and Congress cannot compel the states to enforce the federal laws.
So to answer your question regarding Arizona's immigration law that mirrors federal immigration law... I believe it is unconstitutional and dumb of them to create redundancy laws.
Why unconstitutional? Well - 2 things:
1) one big question is... can you actually make it a state crime when it's already a federal crime? a very interesting legal puzzle for Supreme Court to clarify
2) The original Arizona's new immigration law requires state/local police to determine one's immigration status after any encounter... like 2 cases I mentioned above - without any federal cooperation, it is illegal for state to enforce civil violation of immigration law.
Because we currently have
State Criminal Alien Assistant Program (SCAAP). The federal government reimburses the state of costs incurred incarcerating illegal aliens charged with state/local felony/misdemeanor. The current laws allow state/local police officers to determine one's immigration status after the crime. The original version of Arizona's new immigration law required police officers to determine one's immigration status after pretty much any violations including the very very minor charge and also any police encounter relating to "Reasonable Suspicion" and "Lawful Contact."
Under Terry Stops in Arizona - you are required to give out your full name. You are not required to show the ID. However - because you are not required to show the ID, this new immigration law enables officers to inquire about immigration status based on "reasonable suspicion" that you are in this country illegally. Because the law is so broad, this is a serious police harassment.
1 week later after signing new immigration law, the revision was added. The new version narrowed the scope of law... to same thing as federal law and current law which stated that police officer can inquire about immigration status ONLY during Terry Stops or arrests unrelated to one's immigration status (ie. drunk driving, murder, rape, etc.). We already have this law!!!
Hope my long-ass post answers your question