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The way I interpreted it, only a country (i.e. federal government) can enforce laws about someone violating national borders. Arizona could make a law about state borders (maybe), but not national borders.
There's also the issue of them messing up a federal investigation. INS could be tracking a huge child trafficking case, but a local cop in Phoenix could mess it all up looking for illegal immigrants. If they are going to look for people here illegally, they should get the go ahead from the feds first.
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