HMM:

A 7-pound block of cyanide salt was discovered by U.S. troops in Baghdad at the end of January, officials confirmed to Fox News.

The potentially lethal compound was located in what was believed to be the safe house of Abu Musab Zarqawi, a poisons specialist described by some U.S. intelligence officials as having been a key link between deposed Iraqi leader Saddam Hussein and the Al Qaeda terror network.

Cyanides salts are extremely toxic. According to the U.S. Department of Energy’s Ames Laboratory, exposure to even a small amount through contact or inhalation can cause immediate death.

Just how toxic, I believe, depends on which cyanide salt it is.

Meanwhile the Senate ricin is confirmed as just that, though the source appears to be domestic.