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Perhaps I'm envisaging an ideal world but I'd much rather see some production code they have produced and ask questions about that. It's very easy to gauge someone's knowledge of a particular technology by just talking to them about it.
Asking people to write code on a whiteboard in the pressure of the interview environment doesn't seem very reflective of how they work day to day to me. Perhaps judging them on previous projects or open source work they have contributed to would be a better approach. If someone gave me a pen and a whiteboard and asked me to draw code I think I would likely say thanks but no thanks and walk out of the interview.