Sure would be nice to know.
Mercury was my guess. Shooting at werewolves and vampires should be banned.
I read an article on this. They use the frontal lobes of liberals. As the densest matter known to man, it was thought to be a good substitute for lead.
However, upon rapid acceleration it becomes a blackhole.. er maybe ashhole.. I do not remember.
Any rate it causes a regression to pre-cognative thought in any who are exposed to it.