What kind of drugs would a criminal try to kill someone with?

Jessie’s Girl: What kind of drugs would a criminal try to kill someone with?
I’m writing this story (jeeze, how many of *those* are on Yahoo Answers?) and the main character is caught by a criminal, of whom the main character figured out said criminals crime, and the criminal drugs him. What kind of drug (something fancy, OUTSIDE of the normal boring stuff like morphine and vicodin and blah) could this criminal use? Something that can be injected via liquid, and send him into a state of overdose. Bonus points for finding two drugs that counteract and make the situtation worse!

Answers and Views:

Answer by MrWoodchuck
Brake fluid and chlorine make a spectacular explosion when mixed.

Answer by Heith
sianide i guess, maybe there was another but cant remember it sory im no help

Answer by Slacker
If the main character drinks alcohol then the criminal could mix Alaprozam (Xanax) into his drink. Xanax + alcohol equals an excessive drunken sedated state, often quickly leading to unconsciousness, and if enough alcohol is mixed can easily lead to death.

Answer by Jello F
a needle with an air bubble will do the trick….doctors cannot find it…this is what trained assasins in black are trained to do…. just think of an image of a person from “the matrix”… = modern day….

Answer by Nathan W
A poisonous plant such as Hemlock. An autopsy would only test for normal stuff, not a plant that would need to be grown in a garden, or harvested in a forest somewhere. Unless they knew what they were looking for in the first place it wouldn’t be found.

Or some obscure mushroom that nobody without a mycology degree has ever even heard of.