Huh. That's interesting. I don't plan on ever needing to know that, but it's good to know. They say "silence speaks volumes," I guess... To me, in my experience, what happened in Salinas would be problematic. I know there are people who have a guilty reaction if you accuse them of something, even if they had nothing at all to do with it. "He looked nervous" wouldn't be sufficient to me because, well, he's being interrogated by the police - of course he's going to be nervous. Plus, a description of a person's reaction seems like it would be really subjective, much more so than words they say (which can still be read in different ways, I suppose).