Marc Silver's documentary looks at the lesser-known of the two 2012 incidents of armed white Floridians shooting unarmed black teenagers: On Black Friday at a Jacksonville service station, middle-aged Michael Dunn shot 10 times at a car of unarmed black teenagers, killing 17-year-old Jordan Davis, who had not politely complied when his doughy elder demanded that they turn down the hip-hop on their stereo. Determining the truth is at the heart of the as-it-happens 3 1/2 Minutes, 10 Bullets, and while it's a matter of public record that Dunn was convicted of first-degree murder in October 2014, that makes the film no less suspenseful, and certainly no less heartbreaking.