Pork is weaker. But that red meat probably also causes cancer, mainly colon but possibly also pancreatic and p pstate. The committee described the number of possiblbl mechanisms. Dr. March anna stern ofu sc served on the panel. Processed meats are tretted with different chemicals in order to preserve thehe meat. T. Some of those chem cat chemicals are nitrates and they react in the body to form car cynic agains. Shalene is a nutritionist with the beat el beef association. With reports like this they often confuse us. Its he easy to blld a healthy diet with news like these and nothing in this report should change that. So when we talking out red meat, whatt falls in that category . So red meat is mamalian muscle, were talking about beaf, veel, lamb and yes pork. Pelley pork is red meat. Yes. Pelley why is it being placed in the same category of tobacco. This has lead to so much confusion, being in the highest risk category means you have a substance and there is good, strong evidence that it can cause cancer. Itays absolutely y thing about the degree to which it increases that risk. So we know smoking tobacco increases the risk of cancer dramically. Now processed meat increases the risk of colon cancer relativelylyess. Still, 20 increase if you have the equivalent of a hot dog every day. So now that we have these numbers which is the new thing this study is giving us, it can give us an idea how to estimate our risk and we have to make that decision for ourselves. Pelley the take away in a word is moderation. Everything in moderation including excess. Pelle thank you, jon. Dr. Lapook will be answering your questions on our facebook page. U can post them at facebook. Com back cbseveningnews. The head of the fbi has a theory about what is behind a rise in gun violence in big cities. He talked ababt it today in chicago. And heres justice correspondent jeff pegues. Six people died and 28 were wounded in gun violence over the weekend in chicago. Homicides there are up 19 this year. In other major cities, there have been sharper increases, up 44 in washington d. C. , of 2 in milwaukee, 62 in milwaukee and 73 in nashville. Fbi director james comey discussed the spoke with police cheers today. Some part of what is going on isikely a chill wind that has blown through Law Enforcement over the last year. That wind is made up of a whole series of viral videos and the public outcry that followed them. Reporter the scrutiny of police began after the shooting of michaha brown in ferguson, missouri. Comey believe cell phone video of deadly encounters posted online and freddie grays arrest in baltimore, to eric garners new york, hasas put p pice officers to the test. And could be changing how they work. In todays youtube world, our are officers reluctant to get out of our cars and lele crime. Reporter but comeys remarks put him at odds of president obama. White house spokesman josh earnest. The Available Evidence at this point does not support the notion that Law Enforcement officers around the country a shying away from fulfilling their responsibilities. Reporter comey says he has no data on the youtube effect but said his hunch was Strong Enough to Start Talking about it publicly. Scott, others say the rise in criri is connected to drugrelated violence fueled by increased gang activity. Pelley jeff pegues in our washington newsroom, jeff, thank you. We saw it again late today, social media circucuting a new vidid of alleged abuse by an officer. Its a little bit difficult to watch. Today a sheriffs deputy in columbia, uouth carolina forcibly removed a student from a classroro at Spring Valley high school. Late today the School District said it is deeply the Sheriffs Department is investigating. Today we learn that the woman accused of driving her car into a crowd at the Oklahoma StateUniversity Homecoming parade may have been suicidal. Adacia chambers is held on a Million Dollars bail and faces four counts of murder. One of the victims was a toddler. Today her fathehe spokeke and adrina diaz has more on that. Im very sorry for those victims, and the people who lost their lives. Repororr Floyd Chambers spoke out a aut his daughter minutes before she was due in court. He said she spent two weeks at a Mental Hospital four years ago but had improved. District attorney laura thomas says officers had asked chambmbs if she was suicidal. Her answer was i was suicidal at the time of the disenlt but not now at booking. Reporter prosecutors say on saturday morning chambers ran a red light and drove into the crowd. T ty didnt know what hit them. They didnt have time. Anthony wyatt tried to stop her. I see this car, and the barricade and i jump out and go no, youre going the wrong way, stop, stop, and she floor b brded it. I could just see the wall of people. I knew what was going to happenment and she hit that motorcycle and people went reporter among those killed was 23 year old nikita prabhakar, a business stood fromndia. Husband and wife marchchin and bonnie stone were 65. And had retired from osu. Two year old nash lucas was an only child. Tonight chambers is beimg held on four counts of Second Degree murder. But the da s sd that a fifth victim is in an extremely fragile state. Chambers blood is being tested for drugs and alcohol. Her attorney said those results could take ten days. He also said there was no indication she had been drinking. Scott, she will undergo a psychological evaluation from jail. Pelley add reina diaz, thdnk you. Republican donald trump is feeling the heat from his closest rival, and Major Garrett has that. Reporter confronted with three polls showing him trailing ben carson in iowa, donald trump went on the attack. By the way, cson is lower energy than bush. I dont get it. I saw him being interviewed. Hes lower energy than bush. Reporter that was today in new hampshire. This was friday in florida. Donald trump has fallen to second place behind ben carson. We informed ben but he was sleeping. Reporter carson a retired neurosurgeon offered a less cutting response. I would like to see him stand up for 18 hours and operate on somebody, keep their concentration. Trumps other reaction to losisi ground in iowa, disbelief. I dont believe those polls, actually, because i see the response of people from iowa. Reporter trump also offered a glimp to what he considered the hardships of his early y al estate reer. It has not been easy for me. I started off in brooklyn. My father gave me a small loan of a Million Dollars. I came into manhattan, i had to pay him back and i had to pay him back with interest. Reporter trump entered the new york real l tate market in 1971. 1 million adjusted for inflation would equal 5. 8 million today. Trump also tried to take credit for a ford mot o Company Decision to shift some jobs to ohio from a plant in mexico. Mexico took a ford plant. Have i been very tough on the ford, you heard me talking about ford. I heard last night that ford reporter ford is moving about 1 100 jobs from mexico to ohio, a decision 2011. And one a gop rival of trumps Ohio Governor john caseic helped to engineer. Scott, caseic said t ts entire controversy w w another example of trumps quote empty, false rhetoric. Major garrett for us tonight, thank you. Pelley Vice President biden is letting us in on w he decided not to for the democratic nomination. In an interview for 60 minutes he told Nora Odonnell it all came down to the calender. Look at it this way. I give my word as a biden. I think at the first caucus was april 1st, we probably would be running. Because theres time. How often did the two of you talk aboututhis decicion . Every nighgh well, some mornings we would say like i remember about a month ago we were on the porch at home. And i said, you know, maybe we should just i dont know if we are going to get ere in time. Maybe we should just say were not going. And jill said but what about the supreme court. What about education, what about community colleges. I felt like we were everything wead worked so hd for in this administraraon, you know, could all could just all change. Did you make a list of pros and cons . No, huhuh. Wanted to run. Wewenew t tt two years ago, ive known that since i joined the administration. But the other side was, and it wasnt just since may 30th. When beau passed away. Butt was for the last year, weve been dealing with this with being up and down and then beau would go through a protocol that was with very few people in it and we would have hope. And there would be initial signs that okay. And beau would say, you know, come on dad, were going to be all right here. And you know, so it wawa you know, it was it was a rollercoaster ride. But look, i can die a happy man. We can be a happy family. My never having been president. As long as we continue to stay true to what we believed in, keep pushing for the things that have animated our life. Pelley Vice President joe biden on 60 minutes. Today in the canadian pacififi theearch continued tourist boat capsized yesterday. Five bodies were recovered from the whale watchcng tour off vancouver island. 21 were rescued. No word on the cause. Tonight were getting a look inside last weeks mission to rescue prisoners that were held by isis in iraq. Kurdish trtrps backedy u. S. Spepeal Operations Forces freed dozens of them. And american Master SergeantJoshua Wheeler was killed in the firefight. Elizabeth palmer is in rthern iraq. Is. Reporter the video cacaured on a helmet camera shows dazed prisoners emerging one by one from their cells to be patted down by Kurdish Special forces. Although you can clearly hear the american backup. Right there. Reporter the kurds released this individual video to show their clos partnership with american might. On the well forthied front line near the keel oy key moral bush for the Kurdish Peshmerga fighters who make do with outdated weapons and get their salariess late or even not at all. General Kamal Kirkuki is the area commander. For america, for us, who liberate theivilian peoples live. Eporter to isis fighters, hiding and watching, less than a mile away, the pictures will come as a blow. But freedom has a price. In this case, a exuls ore cacara call for the prisoners to embrace their kurdish kurdish liberators and say thank you. Saad khelef ali feraj is an iraqi policeman who is overcome as he described how isis told him he had only an hour left to live. With this video the kurds want to underscore how with american help they are winning against isis. In contrast to the iraqi army which gets four times as much money from the u. S. , but is struggling to take back the country from extremists. The fact is, though, scott, the kurds have p ptty well con sol datetemost of their territory in Northern Iraq whereas the iraqi army has thousands of square miles to take back from isis. They are making proess at least. But it is painfully slow. Pelley liz pawker in Northern Iraq for us tonight, thank you. We were struck today by pictures from a dre that captured the scope of the refugegecrisis in europe. A grim prosession of thousands walked through a field in slovenia after escaping the wars in syria an afghanistan. Their march to freedom i in western europe was detoured by border closures, yet they marched on. Joined each day by thousands more. Doctors wananto change the way h hh School Football is played after another tragedy. And what happened after part continues. Today a medical panel urged high School Football leagues to ban certain types of tackling to save lives. Another player died last week in chicago an Dean Reynolds is there. Reporter friends, neighbors an coaches of andre smith gathered over the weekend to mourn the 17 year old senior whose life was cut s srt playing a game he loved. His brother eric had a warning for andres teammates. Prote yourself, be cautious because something as sirch el as a foot ball injury can end a whole life. Ter rell alex and certificate a toach. There is no practice for Something Like this. Not something you can write down and come up with a reporter split played for a Chicago High School and was injured on a collision in the last play season. He is the 7th High School Player in the country to die in 2015 from a footballrelated injnjy. In his case, blunt furs trauma to the head. Now the American Academy of pedestriantricks says the way we play the game must change. Proper tackling technique must bemphasized and therere must be zero tolerance for illegal head first hits. Dr. Greg landry coauthored the policy statement. Those are highrisk maneuvers. Those are the kinds of things that are associated with catastrophic injury to both brain and the neck. Landry also said athletic trainers should be available to quickly assess injuries. Nationwide only 37 percent of high schools haha full time athletic trainers like brian robinson. Why arent you on the sidelines at every game. The most common excuse i hear is budget. I think in Todays Society schohos who use that excuse are making a mistake. Never the less, 30 of the high schools in this country, scott, have no athletic trainers. Dean reynoldssn chicagogo dean, thanks very much. A university has removed a back. Pelley the deep south is in deep water tonight. The gulf of mexico washed up on highways in dauphin island, a abama. Streets turned into rivers in hancock county, mississippi. These really remnants of hurricane patrick patricia, the most powerful cyclone ever in the western hemisphere. It hit mexico friday night but the damage wasnt nearly as bad ass feared. But all that moisture now is headed north. A sign of changing times at the university of mississippi. The School Removed for the last time the state flag becacae it includes the con federal confederate battle em blom. The student and faculty asked ole miss to take it down. It is the last state flag to corporate the emblem. In 2001 voters decided to keep it. Today a British Airways 737 crash landed in johannesburg, south africa, after part of the landing gear came off in f fght. Sparks flew as the left wing scraped the runway. But no injuries. The folks at a home for seniors are fighting to get a beloved pet back. And their story is next. This portion of the cbs by pelley each spring i in california the swallows return to the San Juan Capistrano mission. But did you know 400 miles to the north there is a duck retururd to san John Blackstone is there. In a locked pen at a Wildlife Hospital near san francisco, a duck named tape. Assisted Living Center residents are campaigning to winfrey dom for juanita. It doesnt seem right. I want that duck back. Norma manning misses having juanita in the backyard. She was just a nice pet. And everybody loved her. Juanita arrived two years ago, an orphan duck ling. Bello gardens c ck fed her back to health and she quickly became part of life juanita. Bello gardens administrator. This is where juanita lives. The staff built this area for her and put the bond in and the waterfall. But one day in September Juanita wandered away. Someone found her and took her to wild care, a local animal hospipil. And that is where the red tape started. So she gets checked in to wild care and all of a sudden she belongs to the state of california. Not to wild care and in this situation, unfortunately, not to bello gardens. Allison hermanye insists giving the duck back would be a federal offense with dire consequences. S. W wwould lose our operate to operate. The federal government would close you down if you gave back one duck to a Senior Center . Yeah, that is what happened. Bello gardens is helping them apply for a permit to keep the duck asas a pet. Andndhees dnts can visit juanita, trying to make the best of a situation that is all fowled up. John blackstone, california. Pelley and t tts thehe cbs evening news for tonight. For all of us at cbs news all around the world, good night. Captioning sponsored by cbs captioned by access. Wgbh. Org i heard it fire up in the driveway and i instantly just jumped up thats my truck. Right now on cbs 2 news, death h investigation. N. New information on whos behind bars, and why neighbors got concerned when two trucks went missing. Missing. Plus. Trump, stumped. Why these iowa students say they donon want the candidate campaigning at their school and how theyre trying to keep him away. Breaking right now, now,within the last twenty minutes, officials released the name of woman killed in Benton County. 25yearold Sabrina Hustad was found dead, by neighbors, in a drivew sunday morning in the 32hundred block of 59th street trail. Trail. Thats in a a rural arar midway between shellsburg and urbana. Man, 31yearold david miller in custody. Miller went before the Benton CountyDistrict Court this morning, charged with stealing a truck. He lives at the home where hustads body was found outside. Outside. Cbs News Reporter steffi lee continues to track developments and is livivght now with the latest information. Thats right this bloeked off area behind me where neighbors found the woman lying face down is actually david millers driveway. After speaking with police, hes charged with stealalg a truck k from his neighbors, but Police Say Circumstances show he could be tied to the womans death. Death. Im glad i didnt get him out of the truck i dont know what wouldve happened. Justin varner says i iwas davivi millers tight grip that stopped him from getting his truck back early sunday morning before it became a mangled mess. Mess. I heard it fire up in