It is quite likely that it is possible, yes. But what we've said all along — speaking for both the (Roslin) Institute and the PPL staff - is that we would find it ethically unacceptable to think of doing that. We can't think of a reason to do it. If there was a reason to copy a human being, we would do it, but there isn't.
On human cloning, in "Dr. Frankenstein, I Presume?" by Andrew Ross in Salon February 1997.