Section 2(B) Check Immigration Status Based Upon Reasonable Suspicion This section requires state and local police officers to attempt to determine the immigration status of any person stopped under state or local law if reasonable suspicion exists that the person is unlawfully present in the United States. (Note: reasonable suspicion means having a valid reason to suspect unlawful activity, but not enough evidence to make an arrest.) This section also requires state and local authorities to determine the immigration status of any person placed under arrest, regardless of whether the person is suspected of being in the country unlawfully.
NOTES: This is the most critical provision. Despite numerous lower court arguments and endless news and blog disputes, reasonable suspicion has long been settled law. In Terry v. Ohio (1968), the U.S. Supreme Court clearly stated that it does not violate the 4th Amendment.Also, the U.S. Solictor General Donald Verilli himself had to concede that law enforcement officers in Arizona could ask about peoples legal immigration status even before this law passed. Once you concede that, the fight becomes simply whether the state can direct its officers how to exercise their discretion. And that is clearly permissible.
SWA expects the Court to uphold this Section. And it was.