Ask HN: Code Review as Interview Question?

Has anyone here ever had an job candidate conduct a code review on supplied code as part of an interview?

I have a theory that the way someone does code reviews will say a lot more about them than a white boarding problem. 1) You'd get a good sense of their attention to detail and ability to think about code without actually running it. 2) It could cover not just bugs/edge cases/performance issues/depth of knowledge, but also patterns and best practices. 3) You could see their communication style and their ability to offer criticism without belittling people.