Quote:
Originally Posted by cherrylula
arsenic is too slow.
Use succinylcholine, plus it breaks down really fast and is hard to detect.
oops 
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http://en.wikipedia.org/wiki/Ricin
The U.S. Centers for Disease Control (CDC) gives a possible minimum figure of 500 micrograms (about the size of a grain of salt) for the lethal dose of ricin in humans if exposure is from injection or inhalation.
Even so small a dose of ricin as 1/25 000 000 of the body weight may cause toxic symptoms when injected.
Manufactured very easily from castor beans - get cooking!