The other day, I did a short post on a possible U.S. ban on imports of nuclear waste (the importation would be for processing and disposal here in the U.S.). I didn't say anything about the legal issues, because I thought the conclusion was clear -- the ban would be justified under GATT Article XX. However, somebody emailed me with a suggestion that perhaps things were more complicated, so I'll put it out here (briefly) for the audience to comment on.
First off, it's pretty obvious there is a violation here. It's an import ban, which violates GATT Article XI:1. So let's move to GATT Article XX.