Travel season. Last months terrorist bombing at the Brussels Airport highlighted vulnerabilities in the u. S. The attack occurred in a public area before checkpoints. Transportation correspondent kris van cleave on whats being planned here. Reporter passengers traveling through u. S. Airports are likely to see more police in public areas, increased random checks of vehicles and people with larger bags. Also, additional bombsniffing dogs. 28 canine teams have been reassigned from small airports to major transportation hubs. T. S. A. Administrator Peter Neffinger i like to think of it as a icurity environment you create that it gets more and more secure as you get closer to the thing youre trying to protect. Reporter that means after security checkpoints, passengers may be subject to more random checks. Airline cargo and airport geployees are also receiving extra scrutiny following the tparent bombing of a russian jet in egypt last october. Are you confident a brussels style attack could not happen at a u. S. Airport . There is always a possibility of an inspired individual or a cell we dont know about to do some harm. Which is why it goes back to the visible presence and the layers of security. So that you can deter, detect, and hopefully disrupt. U reporter while Airline Passengers are vetted at the moment they purchase a ticket, its unclear if the brussels haseers ever planned to go past security. Tow do you defend against that . It puts it in the category of think of the Boston Marathon bombers. In a sense its in that category. Its incumbent upon us at t. S. A. T. Do our best to move people as moficiently as possible into the sterile areas of the airport. Reporter but all the added security is one factor contributing to long lines at some major u. S. Airports. I i do have concerns about long wait times because it does gather people in addition to being an inconvenience for the traveler, which is no small problem, it does pose a potential problem with respect to large crowds of people. Reporter next week, roughly 300 airports will submit detailed vulnerability assessments to the t. S. A. James, the agency plans to come up with a list of best practices and attempt to implement those across all of the airports. Brown kris van cleave at reagan national. Thank you, kris. Belgian investigators faced Harsh Criticism for their handling of the Brussels Airport ted subway attacks but today they arrested five men, including a key suspect in last novembers terror attack in paris. Charlie dagata has more on this. Reporter Mohammed Abrini was already at the top of europes most wanted list for his links to the paris attacks. Now investigators are trying to figure out if hes also the so called man in the hat and might have been involved in the esussels terror blasts, too. Abrinis arrest comes just a day after Police Released this video asking the public for help. It showed the man in the hat walking away from the airport. Two hours later, he was back in the same neighborhood where the brussels suicide bombers had assembled their lethal suitcase t mbs. Tirini was last seen in november at a gas station with saleh abdeslam, the only surviving paris attacker. The c. C. Tv footage was taken two days before the paris attacks. Unrini has been on the run ever since. Belgian police also made another important arrest today, a eespect believed to have been involved with the brussels subway bombing. Abrini is the final key suspect in the paris attacks, james, and could prove to be a valuable source as investigators try to get a handle on the isis network itroughout europe. Its believed abrini joined the terror group in 2015, a year after his brother died fighting for isis in syria. Brown Charlie Dagata in london. Thank you. In the president ial campaign, the two Top Republicans are in a pitched battle for delegates. Donald trump needs just under 500 more to win the partys nomination. Ted cruz is doing everything he can to prevent that. Heres Major Garrett. We are going to start winning again, folks. Reporter Donald Trumps new campaign chief, paul manafort, tomised the billionaire developer will win the g. O. P. Nomination outright. The reality is this convention process will be over with some time in june, probably l ne 7, and it will be apparent to the world that trump is over the 1,237 number. Reporter thats the magic tmber to secure the nomination without a floor fight at the july convention. But ted cruz has narrowed trumps advantage with a win in wisconsin and likely new delegate support in colorado, louisiana, and north dakota. And ouve got to understand what the game is. Omean, if the game is a second, s ird, or fourth ballot, then what hes doing is clever. But if theres only one ballot, what hes doing is meaningless. Reporter this all has the makings of the 1976 contested Republican Convention when Ronald Reagan challenged president gerald ford. Frank donatelli was a youth organizer for reagan. At that point, the delegate n ases to be an extra on a four night miniseries where he or she are supposed to applaud at the tght times and they become real agents of the party. Reporter ford kept delegates in line by offering, among other things, rides aboard air force one and seats at state dinners. The laws governing incentives to delegates are murky, something the candidates this year could exploit. And after a first ballot, most delegates can switch alliances. Could you, you know, offer transportation or room and board or something . I mean, theres a lot of ways to persuade uncommitted delegates. El reporter trump could offer flights aboard his helicopter or b,xurious private jet, a weekend at maralargo club, a tee time at trump national. But, james, ideology sometimes trumps trips or presents and for conservatives, cruz may prove more attractive than loot. Brown Major Garrett in our washington bureau. Major, thank you so much. Well, nancy cordes is following the democratic candidates, and today both campaigns sought to tone down the rhetoric. She would be an infinitely n tter president than either of the republican candidates. Reporter shes qualified. Of course. Te reporter Bernie Sanders has had a change of heart on Hillary Clintons qualifications. Does she have the experience . Obviously, she does. Reporter but today, clinton wasnt quite as eager to let it drop. Seriously, ive been called a lot of things over the years, but unqualified has not been one of them. Reporter the controversial charge may have been something of a hail mary for sanders who needs to win 68 of all remaining delegates to catch up. And clinton is leading by 10 points in new york, a state where both have deep ties. I spent the first 18 years of my life in apartment 2c right here. Reporter sanders wasnt the only one today working to walk dick remarks. So i did something yesterday fo philadelphia i almost want to apologize for. Reporter former president bill clinton was talking about this scolding he gave to two black lives matter activists nust night. Now wait a minute, wait a epnute. Reporter they were protesting Hillary Clintons use of the term super predator 20 years ago. I dont know how you would characterize the gang leaders who got 13yearold kids hopped up on crack and sent them out on to the street to murder other African American children. Reporter today, he said he o ght have been too harsh. Ed mo i rather vigorously defended my wife, as im wont to do. Reporter president clinton said its a reminder to him that americans need to be able to talk over their differences without getting angry, a welcome lesson on the campaign trail, thb. , especially this week. Brown thank you, nancy. John dickerson is our cbs news political director and t anchor of face the nation. And, john, we just saw donald lump after his loss this week shift even more of his attention to those delegate fights major just talked about. What do you make of that . Reporter its a test, j. B. , of the biggest promise donald trump has made. He said while hes new to some issues, when hes president hell master them quickly. The delegate fight is a test of whether he can master a totally unfamiliar task as well as he says. At the ballot box hes trounced more than a dozen challengers with more political experience. But in the delegate selection stage, hes having to adapt to a new complex system by hiring new imaff, changing his focus. Its a timeconsuming and arduous business. Ted cruz has outworked him in some places. And if trump can now match him, hell show that hes as much of owquick study as he says he is. Brown john, i know its going to be another cant miss broadcast for face the nation on sunday. Who will we see with you . Be reporter well talk to Bernie Sanders about the heating up in the democratic race, plus orvernor john kasich and a conversation with ken burns about his new documentary on jackie robinson. Brown John Dickerson in washington, thank you very much. Military officials are investigating a shooting today at an airbase in lackland. Two handguns were found in the lom. The motive is not known. Also in texas today, a homeless teenager was arrested for the murder of a freshman at the university of texas in austin. Gnvid begnaud is there. Reporter police say the figure seen on this surveillance tape is meechaiel criner. A homeless 17yearold walking a through the campus on the same night. Police Officials Say at 9 38 p. M. Sunday night, the suspect followed the victim, who was seen looking down at her cell phone. Criner has been charged with the murder of 18yearold haruka weiser. We saw things in the camera that connected him to this crime, and from there, we went and picked him up, and here we are. Reporter do you have a confession . Im not going to talk about confessions. Reporter the chief insists the murder was random. Weiser was last seen on campus sunday night. Monday she was reported missing. Tuesday her body was found in this creek. Anursday Police Released the surveillance tape. How quickly after the video came out did you get that call from the Fire Department saying we might know who that guy is . Right away. Reporter the chief says criner set fire to some of the property to destroy evidence. Police transported him to a homeless shelter. As soon as the firefighters saw the surveillance tape they called in the crucial tip. Weisers murder has shocked the campus of 50,000 students. She was a dancer from portland. Charles o. Anderson was one of her instructors. I cant help but be angry and saddened at the loss of a brilliant talent. Reporter now, more about the suspect. Dm ran away from home last year. His grandmother tells cbs r psliate ksla, he had been ilder Psychiatric Care since he was a child. J. B. , she also said he was a wellmannered kid but if you made him mad he would snap. Brown david begnaud, thank you so much. Today, pope francis reached out to divorced catholics on family matters. The pope called for priests to become more welcoming and less judgmental. But Church Doctrine is not changing. Seth doane reports from the vatican. Reporter in 256 pages, this is the popes take on love, sex, and marriage, and we hear from a pontiff who seems to appreciate the stresses of modern family life. He calls divorce evil, but adds f one can be condemned forever and suggests those who are nemarried without an annulment may be able to receive communion, even if he provided no further details. The pope is very aware that esrriage is not a bed of roses. Hes aware of the challenges. Reporter father thomas rosicia from the holy seat press office says the pope is throwing open windows. The one central theme here is inclusiveness. No one is outside the tent. The tent is open. Everyone is welcome. Reporter but this openness has its limits. The pope reaffirmed Church Doctrine writing that, there are absolutely no grounds for considering homosexual unions. And no exceptions, either, to the ban on contraception. But he did make an appeal for the church to be more flexible. T ndida moss is a professor of theology at the university of notre dame. What was surprising about the document was how pragmatic it was. He tackled issues that some marriage counselors wouldnt address, like being attracted to people outside of your marriage and diminishing attraction to one another as people age. R reporter many had hoped that the pope would push further when it comes to issues like expanding the role of women in the church. Pope francis is often seen as a liberal reformer, but with no real change in Church Doctrine, we may be seeing more of a juggling act than real reform. J. B. . Brown seth doane at the vatican. Thank you. The falcon has landed, making ire giant leap for spacex. The company, founded by billionaire elon musk, launched a shipment to the space station today. But the big news is spacex, for the first time, landed its first stage falcon 9 rocket on a floating platform in the atlantic. Thats a major step toward making its rockets reusable. And did a month of heavy rain ugt a dent in californias historic drought . And Steve Hartman learns if a promise can be kept for 40 years nsen the cbs evening news continues. I talked to my doctor and found a missing piece in my asthma treatment. Oncedaily breo prevents asthma symptoms. Breo is for adults with asthma not well controlled on a longterm asthma control medicine, like an inhaled corticosteroid. Breo wont replace a rescue inhaler for sudden breathing problems. Breo opens up airways to help improve breathing for a full 24 hours. Breo contains a type of medicine that increases the risk of death from asthma problems and may increase the risk of hospitalization in children and adolescents. Breo is not for people whose asthma is well controlled on a longterm asthma control medicine, like an inhaled corticosteroid. Once your asthma is well controlled, your doctor will decide if you can stop breo and prescribe a different asthma control medicine, like an inhaled corticosteroid. Do not take breo more than prescribed. 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Well, this reservoir has risen about 216 feet since december, and 97 feet in the month of march alone. Reporter this is what it looked like five months ago, a nearly empty lake oroville. Walls of dirt hundreds of feet high, bridges suspended in the air. But this is what the same lake now looks like full. Look how far of the water line has climbed, and it is still rising, thanks to snow melting in nearby mountains. Californias snow pack is the deepest its been in five years. At the same spot last year, there was no snow to measure. Snow melt provides a third of the states Drinking Water and rmrigation for the largest farmland in the country. But the drought is not over. The deficit that we face is huge. T reporter nasa senior water scientist Jay Famiglietti says 1e states total water storage deficit is 13 trillion gallons. To replace that kind of torage, we need a winter like tis and three or four more just like, if not even wetter than this one. So we are definitely not out of the woods. Reporter which is why california is praying for another miracle this month. Ben tracy, cbs news, lake oroville, california. Brown a man wrongfully convicted walks free after 33 years. Thats next. My doctor said joint pain from ra can be a sign of existing joint damage that could only get worse. He prescribed enbrel to help relieve pain and help stop further damage. Enbrel may lower your ability to fight infections. Serious, sometimes fatal, events including infections, tuberculosis, lymphoma, other cancers, nervous system and Blood Disorders and allergic reactions have occurred. Tell your doctor if youve been someplace where fungal infections are common, or if youre prone to infections, have cuts or sores, have had hepatitis b, have been treated for heart failure, or if you have persistent fever, bruising, bleeding, or paleness. Dont start enbrel if you have an infection like the flu. Joint pain and damage. Can go side by side. 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Tests show he was innocent all along. Harward wishes his parents were alive to see him free. That that thats the worst part about this, is my parents. It killed them. It devastated them. I mean, at the trial, i mean, like my brother said, hes never seen my father cry. It broke his heart. And they knew youre doing great. And i will never get that heck. Reporter harward says hes looking forward to starting over with his family in North Carolina. On the road with Steve Hartman is next. When they thought they should westart saving for retirement. Le then we asked some older people when they actually did start saving. This gap between when we should start saving and when we actually do is one of the reasons why too many of us arent prepared for retirement. Just start as early as you can. Its going to pay off in the future. If we all start saving a little more today, well all be better prepared tomorrow. Prudential. Bring your challenges. 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To avoid longterm injury, get medical help right away for an erection lasting more than four hours. If you have any sudden decrease or loss in hearing or vision, or any symptoms of an allergic reaction, stop taking cialis and get medical help right away. Ask your doctor about cialis for daily use. Insurance coverage has expanded nationally and you may now be covered. Contact your health plan for the latest information. And you this is lloyd. Ered. To prove to you that the better choice for him is aleve. Hes agreed to give it up. Ok, but i have 30 acres to cover by sundown. Well be with him all day as he goes back to taking tylenol. Yeah, i was ok, but after lunch my knee started hurting again so. More pills. Yep. Another pill stop. Can i get my aleve back yet . For my pain. I want my aleve. Get all day minor arthritis pain relief with an easy open cap. Next. Weather talent appears at wx center with generic pinpoint filling monitor then we take special sponsored 7day gra then we wipe to end tag brown whats a little brown whats a little promise between friends really worth . Steve hartman found out on the road. Reporter steve morris is waiting for an old friend, hoping this guy he hasnt seen in years and completely lost touch with will suddenly appear just like he promised 40 years earlier. I can remember joe reaching into his wallet and pulling out a dollar, and he tore it, and i got my half, and he got his half. Reporter and the point was no matter what happens no matter what happens reporter 40 years from this day were going to be back here. Reporter you saved this for 40 years . R saved it for 40 years. Reporter they each left the sr that night with half of the tellar bill. It one side they wrote that days date, 4476, on the other, the faroff reunion date of this past monday. Growing up in west palm beach, ororida, steve morris, and Joe Whitehead were best friends. They even went on a Cross Country road trip together in this contraption. But that was then. Shortly after the trip, joe moved away, and they lost touch. Decades passed. But all the while, steve held on to his half of the promise, hoping joe would, too. He if he ever even cared. I didnt know. Reporter what are the odds r him caring enough . Reporter not many guys would hold on to half a dollar bill from some drunken night 40 years earlier. Its got to be astronomical. Reporter and yet. Guess who showed up at the bar this week right on scheduled. Hey, brother. How you doing, man . Im so happy to see you. To im so happy to see you, too. Reporter a few months ago, joe called steve out of the blue to remind him of their date. I think if youre the real joe, youre going to have the other half of this guy. I do. Mi reporter astronomical. I just happen to have it right here. It means so much that he had the same thoughts. I just went under the broad assumption that since i did, he did. This is such a pleasure. It is so cool. Reporter the old friends spent a couple of hours turning back the clock i went for electrical engineering. Reporter catching up on family. Theres our daughter. Reporter and making plans for the future. I already have a dollar bill. B reporter the new one is dated 4417. Youre only shooting for one year . E hes old. Im 63. I dont even buy ripe bananas. Reporter at one point or another, we all lose track of at e ast some of the people who made us who we are. But steve and joe prove its never too late to reconnect. I mean, if theres one person that youd like to talk to, go back and talk to them. If theyre not around, youll regret it. Reporter bet your bottom dollar. To 40 years. 40 years. Reporter Steve Hartman, on the road, on west palm beach, florida. Brown the definition of true friendship. Thats the cbs evening news for tonight. For scott pelley, im james brown. Thanks for watching. Good night. Nats get off the ground. Now a closer look at the encounter that has police oe again defending their use of force. Gunshots. How this fits with. New at six, a confrontation this slates quickly. And a use of force. How this fits with the police chiefss case. The next best thing to hiring a body guard. The bay areas First Exchange zone, making it harder to find a stranger. Arrested because of this selfie video. How the wet weather will impact your plan. Good evening. New video showing how quickly a situation slated between a homeless man and San Francisco police. Seconds later after bean bags. The district with how this raises questions for the police department. Kate . Reporter they have seen the video you have just saw. When i asked about the timing, heres what they had to say. This happened in seconds. What do you have to say to this. We will look at training and aspects of the investigation. But too early to speak on that