It's also difficult to imagine ball pythons becoming a major problem, if they somehow managed to establish a population somewhere. The US has a well established population of similar-sized rodent eating snakes. Ball pythons would be in competition with them, but their lifestyle doesn't lend itself to their being more successful than the natives. They aren't go-getters the way many of the natives are. I think our raccoons, skunks, and opossums would make short work of them.