I recently stumbled across this report on testing of supermarket and fast-food chicken for Arsenic. The findings were concerning, as it appears very clear that arsenic in the chicken feed is making its way into the meat, something previously unstudied by the USDA.
The links below will let you read which brands and restaurants had arsenic in their chicken and there's a link to the full report as well. I like to buy organic chicken because of its typically higher quality, but this has given me an even stronger reason to avoid generics.
http://www.environmentalobservatory.o... (Test Results)
(Scroll down to the bottom of the page for the full report)