The Myth of Natural Rights

Here's a review of a book called the Myth of Natural Rights, which sounds like something I'd be interested in. The book seems to advocate a similar position that I hold regarding natural rights, though I wouldn't consider myself to be an "amoralist" like the author does, but I do believe that rights are a social construct and not inherent in our existence.

Update: Catallarchy has more on the subject. Indeed, how does one falsify an ethical statement?