I found this and posted it on FR.
http://www.freerepublic.com/focus/f-news/1654560/posts
The article tells about how French farmers are STILL being killed by WW1 unexploded mustard gas and other shells to this day, and farther down the article, tells how collection sites set up for the collection and destruction of these old shells are being "raided", and the shells stollen, and then sold on the black market. If they are "too old and depleted" why are they being "stolen and sold" ????
Also in Belgium they are washing up on the beaches, this includes the agent also. They are from the 100's of tons they dumped off shore back around 1919 or 1920. There are also lakes that have just pure mustard that they dumped it in. It settled to the bottom and is still there.