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And the Supreme Court left open the chance for further challenges if the law becomes discriminatory. In particular, the justices seemed concerned that immigration checks could unconstitutionally prolong the amount of time an officer detained someone during the status checks.

But the court said it’s possible the law could be implemented fairly.

In a statement Monday, Ms. Brewer said police need to be aware that opponents are watching them.

“Our critics are already preparing new litigation tactics in response to their loss at the Supreme Court, and undoubtedly will allege inequities in the implementation of the law,” she said. “As I said two years ago on the day I signed SB 1070 into law, ‘We cannot give them that chance. We must use this new tool wisely, and fight for our safety with the honor Arizona deserves.’”