There are better way, like talking to the friggin interviewee! There was one interview I went on for a government contracting firm (go figure), where I didn't have to give a technical presentation. And the interviewer had the audacity to ask me questions like "When is it okay to lie?", and "If you could invite 5 people to dinner, alive or dead, who would they be?". Little would I figure that he even had the ability or credentials to evaluate answers to such questions. Needless to say, I walked out of there laughing, and gave up on government contracting firms.
I make my interviewees give a technical presentation, when then fosters a technical discussion. I can then easily discern their abilities rather quickly.