Edit:it is believable because forms of cyanide are essential to the manufacturing the products named.
We even used to have a major corporation that had the name American Cyanid( they still exist i am sure, but who they merged with i do not know).
No one can suppress dispersal of Cyanide.
It simply happens to be a very important chemical
<<Because it is easy to make, buy or steal, cyanide poses a significant terrorist threat of mass destruction.>>
Hell i could easily make it simply by mixing Hydrochloric acid with Potasium Cyanide.
When ever in chemistry lab, as one is learning chemistry, when ever you come to need to use KCN, there is box alert saying such as << DANGER, make sure the solution you use is Basic.
If anyone mistakenly mixes HCL with KCN, Hydrogen Cyanide gas will be rapidy generated.
Shout a warning and RUN!
If you should get the scent of almonds in the air --exit rapidly.>>
My problem was "Man this is a big help i have no idea what the scent of almonds smells like. i can see myself 'Hmm, that is a curious scent, hmm , sniff, sniff, is that the scent of almonds? Sniff sniff--' and then as i feel my consciousness going, a last mutter, 'that is al' kerplunk, a dead Max:)"
The use of cyanide gas to terrorize is unstoppable, like i say any 18year old chemistry student can make a brew.
This was actually done in the cyanide gas attack in a Japan subway some years back.
But as a source for MASS MASS DESTRUCTION, that would require high tech, and advanced chemistries i know nothing about.
But cyanide kills swiftly if it is above a certain concentraion in the air.
It's mechanisn is very simple, it simply immediately on contact with blood moving through the lungs, removes the oxygen bond with blood and replaces it with itself.
In high enough concentration you very rapidly lose consciousness and the person turns blue and is quite dead rather quickly.
But as it requires sufficient amounts to generate a concentration to invade a person through breathing, i off hand would think it would only be effective in closed spaces, such as subways.
I actually forget if cyanide gas is heavier or lighter than air, but what ever any device that would be frighteningly effective would need to be heavier than air, or in a confined space.
Mustard gas , that grotesque horror of horrors, was particularly devastating as it would run along the ground like an oozing thickfog, pouring down into the trenches.
But now that we are on the subject of the morbid, Carbon Monoxide(which kills in the same way cyanide kills) would be a very easy to produce to kill in confined areas, and it has the the advantage of being scentless.
One can at least say, those that die in their homes because of a malfunction in their furnace giving out CO in sufficient concentration, die peacefully.
They would likely yawn, maybe say, gees i am sleepy, and drift off, never to awaken.
Regards Osama, i think he thinks on a big scale and is singularly concentrated on targets that would hurt the U.S. economy.
He would like to make unusable such things as the NYC tunnels, or the Chesapeake Tunnel/Bridge.
Osama is very clear on his objectives, as in his last tape, he said we(AlQueda/Mujahadeen) brought down the Russian Empire by the huge costs of fighting us in Afghanistan.
The more money the U.S. has to use to fight their war, the HAPPIER Osama gets.(Bush , in his darkness is extraoridinarly incompetent--he is playing right into the hands od what Al Queda wants, a paranoid freak destroying itself trying to destroy a group of elusive flies---it is also called "Throwing out the Baby with the BathWater, strategem that Bush uses"
One need remember Osama bin Laden knows economics , knows money, is very savvy about the stock market and such.
Though they like to cast Osama as the brave Mujahadeen warrior, the fact was he was the man that handled the money, he knows money.
And he thinks always, how can i break the U.S. economy.
He sees that as our achilles heel, he understands the U.S. economy, and that it is very vulnerable.
I do not believe a true Osama/Zawahiri planned attack will be launched unless it would strike at the U.S. economy.
Read Osama speeches, and he is very specific, just killing people is a waste of energy and time, we must think always, the economy--that is are target.