2-way consent is easy. Get a bumper sticker which says "I record police stops." The police officer comes up you say "Hello officer. I trust you have seen my

2-way consent is easy. Get a bumper sticker which says "I record police stops." The police officer comes up you say "Hello officer. I trust you have seen my bumper sticker. What seems to be the problem?" I think Billy Murphy (a high profile Baltimore defence attorney) suggested something like that with a sign in the cab one could motion to.