In the Suicide Squad comic book, Amanda Waller controls the super-villains by injecting nano-bombs in their arms. There's a moment early on in the comic's original run where Captain Boomerang tells the villain Slipknot that the bombs are fake. Slipknot runs off, the bomb detonates, and Slipknot loses an arm.
This scene is repeated in the Suicide Squad movie. Except here, the bombs are in the neck, and Slipknot doesn't just lose his arm -- he loses his life.