'Pink Slime': Tips for Checking Your Beef

Meat investigation turns up unsavory filler substance used in meat products.
2:53 | 03/08/12

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Transcript for 'Pink Slime': Tips for Checking Your Beef
Now the latest on that ABC news investigation. Into what is in the ground beef you buy at the supermarket last night a whistle blower told us about what he's calling. Pink slime -- kind of -- Used to pump up the volume of meat. Our report sparked an avalanche of emails from UN today we ask ABC's senior national correspondent Jim novelist -- tackle some of them including your number one question. How to tell if there is pink slime in your dinner. It's in 70% of the ground beef sold at supermarkets up to 25%. Of each American hamburger patty. A cheap -- known as pink slime we wanted to see it but the factory said no pictures. It looks -- play though we're just something minutes he can frozen it's -- it's not what. The typical lay person would consider me. The last known glimpse six years ago the movie food -- was given a tour of the factory the low grade trimmings were once only used in dog food and cooking more now. But because of the company's treatment. Simmering in low heat a centrifuge to separate the -- to issue. A spritz of ammonia gas to kill the germs and a quick freeze the USDA says it's safe to eat. That's the final product there the company calls -- finely textured lean beef flash frozen in boxed. More like gelatin and not as nutritious as ground beef. -- post -- -- was once number two a BP I says that's because the protein comes mostly from connective tissue not muscle meat. That'll fill you that it's conducting -- -- Today we were flooded with questions from concerned viewers. Which -- -- stores near me. Do you or don't -- ground beef that contains ammonia treated pink slime. How can respond -- -- retailers. Generally use this time. So we sent on ABC news producers to stores across the country to the meat sections to see if it's in the ground beef they sell. Most couldn't tell -- for sure. There's no way to know even from labels and from the -- here. Whether and that it contains that he -- The guys and meat counter said that he had been getting the same question all day long. We emailed a top ten grocers and America public's Costco AT -- -- a whole foods assured us they don't use pink slime. No word yet from the rest but know this if -- meat is -- USDA organic it's pure meat no questionable filler. But everything else is suspect -- critics because pink slime does not have to appear on the label. And the USDA is giving no indication it will force meat Packers to lift the veil of secrecy any time soon. Jim -- -- ABC news Washington. And Jim answers a lot more of your questions posted online on -- website of abcnews.com. Keeps sending them to us and let us know what -- supermarkets say when you ask them about what's in the meat.

This transcript has been automatically generated and may not be 100% accurate.

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