http://www.slate.com/articles/news_and_politics/jurisprudence/2015/07/do_you_have_a_right_to_film_the_police_sandra_bland_was_arrested_and_told.html

The dashcam footage of Sandra Bland’s arrest is disturbing for a number of reasons—including trooper Brian Encinia’s apparent use of excessive force in subduing Bland. But for civil liberties advocates, a less dramatic moment of the footage is nearly as disquieting. When Bland attempts to film the encounter on her cellphone, Encinia demands that she “get off the phone.” When Bland insists that she has “a right to record,” Encinia repeatedly barks, “PUT YOUR PHONE DOWN!” Eventually, she does. It’s clear she had no choice.