Brian Taylor and Miguel Zavala are close friends and partners in the Newton Division of the Los Angeles Police Department (LAPD) in South Central Los Angeles. Taylor, a US Marine veteran, is recording their police activities for a film project.
Upon responding to a public disturbance call, Tre, a Bloods gang member, yells racial insults at Zavala, who responds by accepting a one-on-one fist fight. Zavala beats and arrests him, but wins Tre's respect for not charging him with assault. Later that night, Tre and his fellow Bloods gang members are attacked by a group of Sureños in a drive-by shooting and one of Tre's friends is killed. The next day, the officers respond to a noise complaint at a house party full of Sureños, where Taylor encounters a gang member named Big Evil, whose truck he later finds is filled with ornately decorated firearms and a large amount of money.