In the movie Batman also leaves batarangs near crime scenes after he's finished as a calling card, for example after he steals kryptonite form Lex Luthor's labs, he leaves a batarang in the place where the kryptonite was stored. He also uses in combat, however rather than disarming criminals, he uses them to stab like a shuriken. In Justice League, Bruce throws a Batarang at Barry Allen to show him that he is aware of his super speed.