WASHINGTON - Newly installed Chief Justice John Roberts on Wednesday sharply questioned a lawyer arguing for preservation of Oregon's physician-assisted suicide law, noting the federal government's tough regulation of addictive drugs. The 50-year-old Roberts, hearing his first major oral argument since succeeding William H. Rehnquist at the helm of the court, seemed skeptical of the Oregon law, and the outcome of this case was as unclear after the argument as before. At the outset, Roberts laid a barrage of questions on Oregon Senior Assistant Attorney General Robert Atkinson before he could finish his first sentence. "It's a tough case," noted...