If you read the article here: U.S. Army Accidentally Grows Marijuana - CBS News title: "U.S. Army Accidentally Grows Marijuana" Basically, the Army used mulch laced with ditch weed near one of their bases. At the end they are talking about how to remove it. lol
That's kind of funny. By the way, your avatar is my background on my computer, it's such a cool image.
Army is using grass to leach the contaminates out of the soil? If they had any common sense, they would know that hemp is quite good at leaching heavy metals and radio isotopes out of soil. In fact, it's used in some parts of the world for that very purpose. See Chernobyl.