Cyanide capsules to kill themselves and stay silent. Every capsule failed.
The Black Hand gave its conspirators cyanide to swallow if caught, so none could be made to talk. After the shooting, Princip bit into his capsule, but it only made him vomit. The grenade thrower swallowed his too and jumped into a river to drown — yet the poison was too old to kill, and the water was just inches deep. Both men were dragged out alive.
