[Captain Kwok]

A lot of chicken you'll encounter in the grocery store is pumped with a solution of salt, water, and phosphates to help counter stress-induced meat characteristics and present a nice visual (not to mention increase the price with extra water weight!). It's so prevalent that having unpumped chicken is probably a rarity for most consumers.

Also, with high volume operations, processors tend to use various concoctions of antibiotics/hormones in feed etc. to help prevent disease and promote growth etc. - these items do make it to the shelf (and surrounding environment) in some quantities.

For Beef it does make a lot of difference. You'll note that all the highest grade beef comes from generally smaller producers that raise their cattle more naturally vs. the large producers.