Do you have periscope installed on your phone? You can live broadcast video to twitter at the press of a button. If you truly believe your life is in danger, a

Do you have periscope installed on your phone? You can live broadcast video to twitter at the press of a button. If you truly believe your life is in danger, and since you already have your phone out it would provide some level of protection if you inform the officer that you are filming the encounter. Make sure you have the screen locked activted and then you can film even with the screen turned off.