http://www.huffingtonpost.com/2014/08/19/sunil-dutta-police-washington-post_n_5692266.html
"But if you believe (or know) that the cop stopping you is violating your rights or is acting like a bully, I guarantee that the situation will not become easier if you show your anger and resentment," he writes. Dutta goes on to encourage people to seek legal recourse after the fact, rather than protest at the time of the encounter. Of course, an April 2014 poll found that half of Americans don't believe cops are held accountable for misconduct, so that likely won't be much solace to most people.