And here's a hint: it ain't yours.
Hours before the law was to take effect, U.S. District Judge Susan Bolton, a Bill Clinton appointee, on Wednesday put on hold its most contentious element: a provision that requires police to check suspects' immigration status during routine stops if there is reasonable suspicion they are in the country illegally.
The decision, a temporary action until the full legal dispute is aired, also blocks parts of the law that ban illegal immigrants from seeking work and require documented immigrants to apply for or carry registration papers.
Bolton noted (read: paid lip service to) the state's concerns about illegal immigration but said enforcement of the provisions "would likely burden legal resident aliens and interfere with federal policy."
The much-anticipated ruling is a (small, temporary) victory for (illegal) immigration rights advocates (and other racists) and the Obama administration, yet it marks just the first skirmish in a swelling legal battle.
Republican Gov. Jan Brewer, who signed the legislation in April, promised an "expedited" appeal of the initial ruling to the 9th Circuit Court of Appeals, while opponents of the law said they would continue their fight to strike it down permanently.
Once the Appeals Court rules, the dispute could head to the U.S. Supreme Court.
"This fight is far from over," Brewer said.
The Obama Justice Department, which filed one of seven challenges to the law, had argued that immigration enforcement was a federal responsibility.
"While we understand (read: pay lip service to) the frustration of Arizonans with the broken immigration system, a patchwork of state and local policies would seriously disrupt federal immigration enforcement," Justice spokeswoman Hannah August said. (But of course the myriad of Sanctuary City policies - designed to interfere with the system - will stand).
Phoenix Vice Mayor Michael Nowakowski, a Democrat, stood outside the federal courthouse here to back the judge's decision.
"You can't have 50 states doing their own version of immigration law," he said.
Bolton's ruling came as supporters and opponents of the law gathered for demonstrations today in Phoenix and as officials in nine states — from Florida to South Dakota — had offered their support to Brewer.
Mexican officials, too, acknowledged the fight (for the reconquering of the Southwest) is not over. Francisco Ramírez Acuña, speaker of Mexico's House of Representatives, urged colleagues to continue preparing for more deportees in case the law eventually takes effect.
"We have to agree to generate sources of jobs (for once), so that these people who are coming from the United States can find some kind of employment in our country," he said.