I'd say people getting killed in connection with drug smuggling has more to do with our insane "war on drugs" than with immigration issues.   
And that's a topic for another thread.

Ron, you're right about "reasonable suspicion" being too vague a concept for a law like this. As I said, this law seems to be designed to line the pockets of those dreaded "trial lawyers" (plus some bounty hunter types) - at the expense of the state of Arizona and many of its cities.