It was my understanding of the new Arizona laws that it makes it "a state crime to be in the United States illegally" (quote cbc.ca).
It was also my understanding that under this new law, police will be required to question anyone who looks like an immigrant. I don't see how that can't increase racial profiling. And like Aoi Midori pointed out, that's only going to affect hispanics, because an illegal German immigrant looks like another white citizen, but a hispanic is hispanic.

As to drug and weapon trafficking, this won't do anything to stop them, since it's immigration, not drugs and weapons. And I don't see how it could help against human trafficking. I mean, they don't just drive around in a car with a bunch of recently brought in 'slaves'. That's not quite how it works.
To me this law is just "anti-immigrant hysteria."