A ground beef display is seen at a Fresh and Easy market in the Hollywood section of Los Angeles

 
A ground beef display is seen at a Fresh and Easy market in the Hollywood section of Los Angeles
A ground beef display is seen at a Fresh and Easy market in the Hollywood section of Los Angeles March 28, 2012. Customers have been invited to bring packages of ground beef from other retailers containing USDA-approved ammonia-treated meat filler, also known as "pink slime", to exchange for one of Fresh and Easy's ground beef packages. Supporters of the U.S. meat industry fought back on Wednesday to slow what they called a smear campaign by consumer activists seeking a ban on meat scraps added to hamburger that critics have called "pink slime." REUTERS/Phil McCarten