"If I remember correctly, it was Ricin on a bb sized pellet. "
Actually, it was much more of an engineering feat than that. It was a hollow sphere, about the size of a pinhead, with about five or six holes in it. The ricin was deposited inside the sphere, then coated with melted sugar to seal the holes. The little projectile was gas propelled, when coming into contact with the guy's leg. After, the sugar would dissolve, and the poison would be released. Quite clever, actually.
I wish I could get a job designing and building these clever gadgets for use against badguys.