I went to a presentation of Busted at the local anarchist book store. The video covers some basics like not consenting to searches and not giving away information if you're a suspect. The presenter was a lawyer who answered questions and added local information. Unfortunately, I hit overload at some point, so I can't remember in what way New Jersey law and practice tend to be more intrusive that Philadelphia's, though at least PA isn't likely to countersue if you try to sue the police.
Anyway, I've seen advice in more than one place to use submissive body language when dealing with the police. The video implicitly recommended solid (a little on the assertive side of neutral, I'd say) body language. I asked the lawyer about it, and he said he didn't think submissive body language helped, and overdoing it could make the police suspicious.
Anyone know if there's evidence one way or the other?