that is the cover story by peter waldman. investigate the dark places in the united states. in this case he's looking at the meatpacking industry. >> lot of these workers are undocumented immigrants. getting injured and they don't have the incentive, in a sense, to whistle blow and talk the conditions they're working in. > there's a lot of rift shifting on to the sanitation companies. lot of aspects to this. given that ritical we've got congress deciding how to tackle immigration reform forward. >> sheds a light on a very important part of our work force. >> we beal back. is this a phone? or a little internet machine? it makes you wonder: shouldn't we get our phones and internet from the same company? that's why xfinity mobile comes with your internet. you get up to 5 lines of talk and text at no extra cost. so all you pay for is data. see how much you can save. choose by the gig or unlimited. xfinity mobile. a new kind of network designed to save you money. call, visit, or go to xfinitymobile.com. ♪ david: are there many who said, i want to be the leading cellist in the wor

carol: we have more from peter waldman and what he says points to a dark place in human united statesistory. peter: the third shift is so named because it's the graveyard shift. it begins around midnight and it is the folks that come in and clean poultry plants and these , people use high-powered hoses and all kinds of chemical cleansers, usually chlorinated. they generally clean meat packing machines while they are operating, so there are lots of blades and blenders spinning. steam is wafting everywhere. these are the folks that come in and clean. very often, they are immigrants. this is not a desirable job. it's sort of the bottom of the labor ladder in the united states and even more often, they are undocumented immigrants. julia: so in that vein, peter, talk to us about martha and her experience because you begin her story in graphic detail. peter: sure, i call her martha because torres was only one of the surnames given to her by several people in the documents we reviewed. the reason is that she was or is an undocumented person. we don't know if she is in the united states or no

julia: peter waldman discussing his story. it was quite fascinating.million people working in foreign-born, 30% and we do not know how many of these workers are in documented, up to 75% of them in certain cases. scarlet: i also found striking that the u.s. postal service was in the employer's where this happens most frequently. that is a federal organization. julia: and the question here -- in this case, we are talking about the concerns, the lack of ability for these people to step forward. scarlet: someone needs to help. julia: the occupational safety and health administration have find the places, but they are miniscule. scarlet: not enough to change behavior. julia: i another big concern is that the powers of the lawyers -- they go into this -- the powers of the lawyers that ies under the compan fourth amendment rights, you can only investigate a certain incident. you cannot look for something that might be dangerous. incredible. a great story, i recommend that you should read it. that is available today on newsstands and online. here more from the