Is your favorite beer or wine trying to poison you?

A recent study found that many brands of beer made by Budweiser and Coors as well as Sutter Farm wine were found to contain traces of the weed killer known as Round - Up.  Yes, I'm serious...this is real.  The following quote was posted by KFOXTV.com:

Many brewers said they are against the use of the chemical but at the same time say the amount of the weed killer found in their beverages is below Environmental Protection Agency limits. - KFOX

WTF?? It's bad enough that there is weed killer in the beer and wine but, it's also showing up in some foods. The lack of concern in their reply makes it even worse saying ... basically ... that it's cool because the amount of weed killer is below the EPA limits?

How the hell does weed killer get in beer to begin with??