In 1995, the U-S banned the import of all shrimp caught without turtle excluder devices. But, the ban might be in violation of international trade laws in the view of Thailand, Malaysia, India and Pakistan. They've appealed to the World Trade Organization to force the U-S to rescind the ban. Thailand already requires its shrimpers to use turtle excluder devices, so Steve Curwood asked Harvard Law Professor William Alford why the Thais joined in the case.