What's wrong with this picture? Using paintball guns to kill weeds

I first saw this post a few days ago on the weather channel. (www.weather.com) It is about a new idea to use paintball guns to "shoot" herbicides with "sub-meter accuracy". Take a look (and listen) at this short video and see if your reaction is the same as mine.

Do you see and hear the wind, catching and carrying all of those dangerous herbicides into the air?

I tried to do a little online search to see if I could find out more information about this topic and strangley enough, the only discussions I found about it were on Paintball Forums, where at least one user (on pbnation.com) was astute enough to provide this comment:

Hopefully the herbicide in the ball isn't harmful to humans. Or am I the only one that sees a problem with being able to shoot poison from a paintball gun? It's bound to fall into some kid's hands at some point if it's released.