Coming To A Theater Near You!

I've always been wary of herbicides, mostly because I could never figure out how they worked. Pesticides could be made to kill all kinds of insects; that was clear enough, and no one would argue that pesticides are bad for plants as well as the environment. Herbicides, on the other hand, had to be pretty complex in order to kill only weeds but not grass, I always thought. But how do they work? And are they safe?
I read an article years ago in which a mother recounted the story of how each time the gardener at her apartment complex came every four months to treat the grass for weeds, her daughter would lose all bowel control for a week. That's pretty scary, wouldn't you say?
Here's a preview to a movie that sounds really interesting. It's the story of a small town that actually drove the lawn chemical companies out of town...
http://www.organicconsumers.org/articles/article_18542.cfm