Love the idea of a stop and frisk app: http://www.nyclu.org/app A more general "I'm being forced to do something against my will" app would be real handy, I think, especially on the 2nd or 3rd generation of google glass.
The general advice there is to start recording immediately, keep your mouth shut, and use a save-to-the-cloud video app like Bambuser so the fuzz can't erase your footage.