content: I carry as well and my instructor told me to be very cautious with cops and to tell them that you are carrying as soon as they approach the window and do not even think about doing anything that can look like you are reaching for it. He said whenever he gets pulled over, he offers the officer to grab it themselves if they want to see it. In hindsight I don't think  Castile was going to do anything nefarious but he was extremely stupid ignoring the officer repeatedly.