No regard for house rules...

I am living with a 17y.o. boy who has absolutely no regard for house rules. I ask him to not download porn from the internet becasue it is not allowed in this house, and he does it anyway. When confronted he lies and says he doesn't know what I'm talking about. I removed his used account from the computer, and he hacked into it. I disconnected the computer modem, and he figured out how to tap his laptop into the neighbor's wireless. Every move I make, he circumvents, until I am ready to scream. And not just that, it's everything. He's grounded right now, but that doesn't matter because he ignores all the restrictions anyway, when no one is looking. Both his father and I work, so he can't be watched 24/7. Is there any hope? Signed, "At rope's end"