So in a way this is a bit of peer pressure on School Districts and bus makers to install seat belts, and for good reason, scott. Nhtsa says if it has to go through the regulationmaking process that could take up to a decade. Our transportation correspondent kris van cleave. Thanks, kris. The cbs overnight news will be right back. With three simple words. My name is chris noth and i will listen. From maine to maui, thousands of High School Students across the country are getting in on the action by volunteering in their communities. Chris young action teams of High School Students are joining volunteers of america and Major League Baseball players to help train and inspire the next generation of volunteers. Carlos pea its easy to start an action team at your school so you, too, can get in on the action. Get in on the action at actionteam. Org. cause youll be in my heart yes, youll be in my heart from this day on now and forevermore. Narrator if animals are our best friends, shouldnt we be theirs . Visit your local shelter, adopt a pet. Youll be in my heart no matter what. Cbs cares. If you were a hippie in the 60s, you need to know. Its the dawning of the age of aquarius. Yeah, and Something Else thats cool. What . Osteoporosis is preventable. All osteos preventable . Right on if you dig your bones, protect them. All cbs cares in the race for president the top eight republican candidates will meet tomorrow night for their fourth debate, and a poll out today puts ben carson just slightly ahead of donald trump in south carolina, an early primary state. Marco rubio is in third place. Hillary clinton is far ahead on the democratic side, which is forcing a change in tone from her competitors. And nancy cordes has that. Reporter in concord, New Hampshire today Hillary Clinton filed her papers to run in the nations first primary, a race thats growing sharper by the day. That is not hillarys clintons position at all. Reporter vermont senator Bernie Sanders has gotten bolder in calling out the frontrunner. I have many disagreements with Hillary Clinton. And one of them is that i dont think its good enough just to talk the talk on Campaign Finance reform. Reporter six months ago sanders was reluctant to draw even mild contrasts. Do you think youd be a better president than Hillary Clinton . Its not a question of personality. Hillary clinton is a very intelligent woman. Reporter but hes now begun taking subtle digs at clintons character. In his First Campaign ad. An honest leader. Reporter and at a democratic dinner in iowa. Every day i will fight for the public interest, not the corporate interest. Reporter on thursday sanders told the boston globe, i disagree with Hillary Clinton on is that your experience . Everything . Oh, no. Of course not. That would mean he doesnt agree with me on equal pay for equal work, he doesnt agree with me on paid family leave, he doesnt agree with me on making sure the minimum wage. Thats obviously not the case. Reporter sanders sharpened his rhetoric was clinton was more confrontational than he expected at the first democratic debate and after polls showed her closing the gap here in New Hampshire, which is his strongest state, scott. Nancy cordes on the campaign. Nance, thank you. Cbs news will bring you the next democratic debate from des moines, iowa on saturday at 9 00 p. M. Eastern. Of face the nation, will be the moderator. Two americans were killed today when a Jordanian Police officer opened fire at a Training Center near amman. The two americans worked for a u. S. Government contractor training palestinian police. Three others were killed. The officer was shot dead. His motive not clear. An act of terror is suspected in the russian jet tragedy, and cbs news has learned that investigators are focusing on the sinai branch of isis. The leading theory is that a bomb brought down the plane over egypt, killing all 224 on board. Russia has canceled regular flights to egypt and is evacuating more than 40,000 of its citizens. Today a u. S. Senator called for hearings after a 60 minutes investigation last night. John tester of montana said that the broadcast exposed flaws in background invesesgations that are used to grant security clearances to federal employees and contractors. Tonight we have more of our investigation on this broadcast. This time a look at how people who hold on to their clearances are able to do so even after crimes and psychotic behavior. In 2013 aaron alexis was profoundly psychotic when he murdered 12 people in a navy office. He was a contractor with a security clearance. Building because he was supposed to be there with full access to should have been able to get to. Reporter Paul Stockton is a former assistant secretary of defense who led an investigation. He found that after alexis got he was arrested for firing a bullet through the ceiling of his apartment, arrested for vandalizing a nightclub, and he it was shocking that he was able to get and retain a security clearance. Reporter but alexis retained the clearance because by regulation it was up to him to selfreport his crimes to his superiors. Otherwise, his clearance would not be automatically reevaluated until it expired after ten years. Army specialist ricky elder is a similar case. After he got his clearance he was charged with two assaults, a dui hitandrun and aggravated battery. It took five years to suspend his clearance after which, during a briefing, he killed his commander and himself. How do you assess the National Security clearance process as it exists today . I think its elaborate and woefully insufficient. Reporter former deputy secretary of defense john hamre says people are clearances should be monitored continuously for signs of Mental Illness or criminal behavior. Once youre in youre in. Once youre in youre in. We should be turning this thing upside down and saying what are the key jobs that are so sensitive that were going to be monitoring these people intensively, continually. If you would like to see our full investigation, you can find it at cbsnews. Com. Click on 60 minutes. Russia could be banned from the next summer olympics after the World Antidoping Agency said today that russia is doping at all levels. The report said the cheating is organized by the russian government itself. The Antidoping Agency said that a moscow lab destroyed nearly 1,500 athlete test samples to keep them from investigators. And russian intelligence agents enforce the cheating. What we knew about Blood Pressure may be wrong. An important new study. And shamus days as a performer are numbered. The cbs overnight news will be right back. Its the final countdown the final countdown if youre the band europe, you love a final countdown. Its what you do. If you want to save on car insurance, you switch to geico. Strong hair can do anything just like you strong. Is beautiful pantene its judgment day. The inlaws, the typea cousins, siblings and back seat chefs have all assembled to look inside your oven. But youve cleaned off all the bakedon business from meals past with easyoff, so the only thing they see is that big, beautiful bird. Mmmmm go ahead. Let em judge. I asked my dentist if an electric toothbrush was going to clean better than a manual . He said sure. But dont get just any one. Get one inspired by dentists. With a round brush head. Go pro with oralb. Oralbs rounded brush head cups your teeth to break up plaque and rotates to sweep it away. And oralb delivers a clinically proven superior clean versus sonicare diamondclean. My mouth feels super clean. Oralb know youre getting a superior clean. Today seaworld announced its controversial killer whale show at its San Diego Park will be phased out. Heres ben tracy. Reporter san diego is saying so long to the shamu show. Seaworld says by 2017 it will replace the theatrical killer whale show with what it calls a more natural experience with a conservation message. Ceo joel manby gave few details while making the announcement on a call with investors. We start everything by listening to our guests and evolving our shows to what were hearing. Somethings wrong. Reporter what theyre hearing has not been good. Sea world has been under fire since the documentary blackfish was released in 2013. It criticized the companys attacks on their trainers. In 2010 dawn brancheau was killed when one of the whales pulled her into the water and tore her apart. Attendance has been falling, and the company has lost half its market value in the past two years. Former sea world trainer john hargrove. People can be inspired and not have to see a caged animal that has given up their life for you to be entertained. Weve just moved past that. Reporter last month the California Coastal commission barred the park from breeding orcas. California congressman adam schiff plans to introduce legislation to ban breeding of captive orcas nationwide, which would impact sea worlds other parks. I view the step taken by sea world today as small but positive. But it really needs to go much further. We really need to end the captivity of these majestic creatures. Reporter now, sea world is only ending the killer whale show at its park in san diego. Scott, the company says the shows will continue at their parks in orlando and san antonio, texas. Ben tracy, thanks. Come back. Tonight we have results of a new study that says sharply lower Blood Pressure leads to significantly longer lives. We asked our dr. Jon lapook to explain. Reporter current guidelines for people with high Blood Pressure generally target a level of below 140, for those age 60 and over below 150. This trial followed more than 9,000 people over 50 with high Blood Pressure and at least one other risk factor for heart disease. Doctors used medication to lower their pressure to under either 140 or 120. Early when data showed a clear difference in outcomes. Results published today show the under 120 group had a 38 lower risk of Heart Failure than the other group and a 27 lower risk of death. However, the under 120 group also had more serious side effects, like low Blood Pressure, fainting, abnormal blood chemistries, and kidney problems. Dr. George bakris of university of chicago medicine specializes in treating high Blood Pressure. In these people that are older you can push the Blood Pressure down to 120. It is well tolerated, and there is a benefit. So jon, what are doctors likely to do with this information . Well, scott, doctors tend to be cautious. While the more aggressive treatment does lower the risk of those heart problems, it can increase the risk of those other side effects we talked about. So i think were going to see an ongoing discussion of the pros and the cons. Jon, thanks very much. Well, there was plenty to talk about about what happened in meridian, mississippi on saturday night. As folks ate inside an ihop theparking lot was gobbling up their cars and trucks. 14 in all. The sinkhole is 30 feet wide, 360 feet long. No one hurt. 211 years after dying in a duel, hamilton is bigger than ever. Thats next. Severe shortness of breath. Unexplained nausea. Cold sweats. Theres an unusual tiredness and fatigue. Theres unfamiliar dizziness or lightheadedness. Unusual pain in your back, neck, jaw, one or both arms, even your upper stomach, are signs youre having a heart attack. Dont make excuses. Make the call to 911 immediately. Learn more at womenshealth. Gov heartattack. Bipolar disorder is a brain condition that causes unusual or dramatic mood swings. It affects millions of americans and compromises their ability to function. When diagnosed, bipolar disorder can be effectively treated by mood stabilizers. But most people with bipolar disorder suffer for years without help because the symptoms are missed or confused with other illnesses, like depression. Learn how easily you can help keep this from happening to a loved one. Alexander hamilton and hiphop might seem like an unlikely pair, but the combination is the hottest ticket on broadway. 57 million in advance sales and counting. Linmanuel miranda is the playwright and the composer, and he also plays the main character in hamilton. Charlie rose sat down with him for 60 minutes. This is what i knew from high school. I knew hamilton died in a duel with the vice president. I knew he was on the 10 bill. But really i just was browsing the biography section. It could have been truman. Happened . I was thunderstruck. I got to the part where, you know, a hurricane destroys st. Croix where hamilton is living and he writes a poem about the carnage and this poem gets him off the island. You saw a rap artist in him. Yes. I drew a direct line between hamiltons writing his way out of his circumstances and the rappers id grown up adoring. Reporter mirandas gift is making that story come alive. Are you ready for a cabinet meeting, huh . Reporter witness hamiltons battle with jefferson over how to pay off the revolutionary war debt. In virginia we plant seeds in the ground we create you just want to move our money around this Financial Plan is an outrageous demand and theres too many damn pages for any man to understand thomas, that was a real nice declaration welcome to the present were running a real nation would you like to join us or stay mellow doing whatever the hell it is you do in monticello a civics lesson from a slaver hey, neighbor your debts are paid because you dont pay for labor we plant seeds in the south, we create yeah, keep ranting we know whos really doing the planting i think the secret sauce of this show is that i cant believe this storys true. Its such an improbable and amazing story. And i learned about it while i was writing it. And i think that enthusiasm is baked into the recipe. For this tuesday. For some of you the news continues. For others check back with us just a little later for the morning news and cbs this morning. York city, im scott pelley. He. Announcer qus the this is the cbs overnight news. Welcome to the overnight news. Im jericka duncan. For more than 50 years the nation of myanmar, also known as burma, has been ruled by a military dictatorship. But early returns from sundays parliamentary elections shows the age of the generals has likely passed. The Opposition Party led by Nobel Peace Prize winner Aung San Suu Kyi is already declaring a landslide victory. Opposition candidates have captured nearly every seat in rangoon, the biggest city in the country. The countryside. Before the vote Bill Whitaker paid a visit to burma and the woman they call mother sue for 60 minutes. Reporter theres a timeless quality to burma. Its a place almost untouched by the outside world. For about a half century the military kept burma locked away, impoverished, as if in a wretched time capsule. For as long as anyone can remember, monks in saffron robes have flowed from monasteries to collect alms each morning. In this overwhelmingly buddhist country the faithful come to the center of burmas largest city, rangoon, to pray at the most sacred shrine. But it was burmas most wellknown living symbol we wanted to meet. Very nice to meet you. Reporter Aung San Suu Kyi, the woman who had the courage to stand up to the junta. Just a few years ago people could be jailed for possessing her picture. Now her image is everywhere. She is the face of the new burma. People want a happy ending. They want burma to be a success story. There are too few Success Stories and too few happy endings in this world today. But i always say that you dont get something simply because you want it. Do you believe that burma is on the path to democracy now . Its not firmly on the path to democracy. We are on the path to disciplined democracy. What is disciplined democracy . I think its democracy as seen by military authoritarian leaders. Does it fit with your idea of democracy . Not an exact fit, no. Reporter to reach suu kyi we traveled five hours by road from rangoon deep into the heart of burma. There are about 50 million burmese. This is how most of them live. Our destination was this extravagant city the generals d. C. Its called naypyidaw, burmese for seat of the king. They moved the capital here from rangoon a decade ago. It was built in secrecy and no one would tell us how much it cost. It has an orwellian feel with grandiose buildings, deserted tenlane highways, and most bizarre, almost no people. This place is for rulers, not citizens. And its not a place suu kyi feels comfortable. Shes here only because shes now a member of parliament. When you look at this and the power it represents, what makes you think you can change this . It does not present itself as part of the country, as part of the people. And however impressive this complex may be, it doesnt really represent the people. San suu kyi she seemed calm, almost serene, but after talking with her for a while we noticed the steely determination that got her through nearly two decades of house arrest. Youre a toughminded person, arent you . I never thought of myself as being particularly brave. I used to be frightened of the dark when i was small. And im not very good with dead rats and things like that. But face what has to be faced. And i hope as best as im able. You must know that you are seen worldwide as a symbol of democracy. No, i dont like to be called a symbol, and i dont like to be called an icon. I will just say that i have to work very, very hard. So id rather be known as a hard worker. I dont think symbols do much, nor icons. Reporter suu kyi caught the world as tension when she first burma in 1988. The generals crushed her movement, killed and imprisoned her followers, and put her under house arrest. After a nationwide revol