Tonight meet the brothers mothers. If villanova win, we win. U. N. C. Win, we win. Captioning sponsored by cbs this is the cbs evening news with scott pelley. Pelley on the eve of a possible gamechanger primary in wisconsin, our cbs news Battleground Tracker shows that ted cruz has a sixpoint lead over donald trump. John kasich is a distant third. For the nomination, trump needs to win a little over 60 of all the remaining delegates. Thats doable, but it cant happen before the last big primary night on june 7th. For cruz and kasich, it is all about keeping trump from locking up the 1,237 delegates, forcing the g. O. P. Nomination battle into a contested convention in cleveland this july. Heres Major Garrett. Reporter ted cruz met in kenosha today and predicted a victory in tomorrows primary. Wisconsin is going to be pivotal. It will be pivotal for the national debate. The entire country is looking at wisconsin. Reporter crzs campaign is focused on picking up delegates in states with caucuses and party convention, including utah and just this weekend colorado and north dakota. If we have a good night tomorrow, that will be four states in a row where donald trump has gotten whooped. Your vote is going to be very important tomorrow because the world is watching wisconsin. Reporter trump trails cruz in wisconsin but remained optimistic. I really believe tomorrow were going to have a very, very big victory. Very, very big. Reporter trump and cruz are also calling for Ohio Governor john kasich to drop out. Its very, very unfair just to have a stubborn guy like that to be campaigning, and ill tell you, its really unfair to other candidates who did much better than he ever did. Reporter kasich hes the only republican running ahead of Hillary Clinton, and that should hold sway at a contested convention. Theyre attacking me in wisconsin. For a guy thats not doing very well, they sure are worried about me, spending a lot of money trying to knock me out, but theyre not going to be successful. Reporter trump splits the i mean, kasich splits the antitrump vote, and along the way he may take a small number of dell grants from trump and kasich rather from trump and cruz. Scott, kasich admits he has no chance of winning this nomination outright but hopes along the way to do just well enough to force that socalled contested convention. Pelley Major Garrett on the campaign. Major, thank you. Republicans are preparing for what could be their first contested convention in 40 years. Now we have some insight on all of this from john dickerson, the anchor of face the nation. John, you were briefed by republican officials on the rules of the convention. Why are they doing that in. If there is an open make sure the press understands complicated. Before the delegates even get to the business of voting on the nominee, for example, there is an opportunity for disagreement over the rules and even who is eligible to be a delegate in the first place. And at the convention, all the candidates and their supporters are going to be energized and on shenanigans. There is enough complexity to make any losing party feel like theyre being robbed. There were epic fights of this kind over rules and credentials in the last two really contested g. O. P. Conventions in 1976 and 1952. Pelley now, the delegates will be selected in the states, many of them by state conventions before the national convention. Theres a lot of effort by the campaigns to influence that. Thats right. Most of the delegates are bound to a candidate on the first ballot at the convention in cleveland, but if no candidate gets a majority, nearly all the delegates can then vote as they please. What theyre trying to do in these state conventions is with them at the convention in cleveland through the first ballot, the second, the third and all of them. Candidates who dont have a delegate pledged to them on first ballot are trying to win over their support in future votes. Pelley if the republicans dont have a nominee until late july, does that put them at a disadvantage for the election in november . It depends on who the democratic nominee is to see how steep a hill they would have to climb. Starting late isnt a big problem because there will be a lot of republicans who vote for the candidate almost no matter who it is, but if there is no unity coming out of this convention, and they have to clean up after a big fight, that will be a problem. Pelley john dickerson, our political director and anchor of face the nation. John, thanks. Now for the democrats, our wisconsin Battleground Tracker finds Bernie Sanders and Hillary Clinton in a virtual tie. Nancy cordes is covering. In the last few weeks alone, california, new york state, 15 an hour. Reporter raising the issue for Bernie Sanders. But today it was his opponent celebrating with new yorks governor over the states big new hike. This is such a great day for our state. Reporter clinton favors raising the federal minimum wage to 12 an hour. Sanders would go to 15. His more liberal stance on issues like that has fueled a string of recent victories in democratic caucuses. Hes hoping to rack up one more in wisconsins primary tomorrow. If we win here, were going to have a bounce going into new york state, where i think we can win. If we win in new york state, between you and me, i dont want to get Hillary Clinton more nervous than she already is. Reporter clinton is working to build a fire wall in new york, a state she represented in the senate for eight years. I am looking forward to the next two weeks to travel throughout the city and the state. Claim to new york, too. He grew up in brooklyn and is searchinging for a prime time debate there, though he says the clinton camps proposed dates are unacceptable. Doing it during the ncaa finals makes no sense. Doing it in the morning when people are not going to be watching it in large numbers makes no sense. Reporter sanders outraised clinton by 15 million in march, the largest margin yet. That means, scott, he has the resources to blanket the airwaves here in new york if he wants to, and the stay in the race no matter what happens here. Pelley nancy cordes following the democrats for us. Nancy, thank you very much. Now, there is a breaking news story tonight. Five people have been killed after a sightseeing helicopter crashed in tennessee. They were on a tour of the Great Smoky Mountains southeast of knoxville. The chopper went down, burst into flame, but we have no word yet on a cause. We have learned more today about the collision that derailed an amtrak passenger train outside it killed two people and injured many more. Kris van cleave is on the investigation. Reporter twisted wreckage shows the force of the deadly collision. Train 89s engineer hit the emergency brakes five seconds before striking the backhoe. The train was going 106mph, just under the 110mph speed limit. Were still gathering facts on that information. As to who had the authority to be on that track. Reporter ryan frigo with the National Transportation safety board says investigators have examined the trains event recorder and dash cam ras. The video shows that there was Construction Equipment on the track, and work train equipment on the track immediately adjacent to the amtrak trains track. People injured were sitting in the trains front car. Longtime amtrak employees joseph carter, jr. , age 61, and peter adamovich, 59, were killed on the backhoe. Federal guidelines require before construction work can be done on train tracks, including making the track physically inaccessible to a train and having a watchman present who can give a crew a 15second warning before a train enters a work area. Amtrak acknowledges its track work procedures are now being reviewed. New york senator chuck schumer. There is virtually no excuse for a backhoe to be on akbartive track. Reporter it is the second deadly amtrak accident in pennsylvania in less than a year. Last may train 188 derailed just 20 miles north of chester, killing eight and injuring more than 200. The cause is still under investigation, but the train was going twice the speed limit around the curve. We dont know if the engineer knew he was entering a work zone and should have slowed down sooner. Scott, tomorrow the n. T. S. B. Is send to interview the surviving members of that work crew. Pelley kris van cleave at the scene of the crash tonight. Kris, thank you. Tonight we have a rare look at how the rich and powerful hide money. A group of reporters has gotten files from the computers of a law firm in panama that specializes in stashing money in Shell Companies off shore. Don dahler takes a look. Reporter some of the names revealed in the documents are a rogues gallery of dictators and criminals, but also included are 12 World Leaders who have allegedly evaded taxes in offshore accounts. The unprecedented leak had an immediate impact. In iceland the Prime Minister walked out of an interview after he was asked to explain how he and his wife used an offshore company to allegedly hide a 4 million investment. Huge crowds gathered today to demand his resignation. In ukraine, while his country was at war, the leaked documents indicate that president pedro porshenko moved his business fortune to the British Virgin islands to avoid paying taxes. And british Prime MinisterDavid Cameron is facing questions about his fathers offshore investments. Michael hudson is among the reporters who have been studying the paperwork makes it clear they wanted it structured in a way that the profits from these investments would not be taxed in the u. K. Reporter Mossack Fonseca specializes in offshore finances. While thats not generally illegal, journalists who have seen the documents say the leak reveals Money Laundering scream, sanctionsbusting and other crimes. Former treasury officer chip poncy. Every one of these devastating times of harms release on financial support, infrastructure, and its often serviced by what you see in the panama papers. Reporter the documents also show how Close Associates of Vladimir Putin allegedly ran a multibillion dollar Money Laundering ring through bank rossiya while it was subject to u. S. Sanctions after russia annexed crimea. And syrias government circumvented International Sanctions using Shell Companies in the seychelles. In an interview with a firms cow founder, ramon fonseca, said theyve never been found guilty of anything in their 30 years of business. We are a knife factory, he says, that sells knives. And if the knife is used for a murder, were not responsible. So far no american politicians or companies have been named, but there are other investigations already under way around the globe, scott, including australia, germany, the neatherlands and france. Pelley all of this just beginning. Don dahler, thank you. Brussels is flying again. There were 39 flights from the airport today. There are usually about 600 before the terrorist bombing two weeks ago. Isis bombers killed 32 at the airport and a subway. Today for the First Time Since the flood of refugees overwhelmed europe, the flow was reversed. More than 200 were sent home with more to follow under a new deal between the European Union and turkey. This. Reporter the migrants were bused into lesvos court before dawn and behind lines of riot police. Each person being sent back had a chaperon and we captured proof that their wrists were bound while on board the buses. The greek authorities said none of the migrants had applied for asylum in europe, but thousands of other people in greece, who were at risk of deportation, have fled war in syria and iraq. And then risked their lives to cross from turkey the greece in rickety boats and inflatable rafts. Greeces refugee camps have now become Detention Centers. Fencedin behind razor wire, we met abdulrahman balash, who told us he came from damascus in syria and wants to go to germany or sweden where its safe. But the greek Police Quickly intervened. Why cant we and then ended of interview. Some migrants havent been able to contain their frustration in recent days. Several hundred people even managed to break out of the Detention Center on the island of chios. This is a universal human right. Reporter Boris Cheshirkov is a spokesman for the United NationsRefugee Agency and fears that europes determination to stop the migrants could mean that some are not given the protection they deserve. They have to be given an individual process so they can explain why they have to say because they fear for their lives. Reporter the question now is whether locking migrants up and deporting some of them coming. There has been a drop in numbers this morning the greek government said that more than 300 people had arrived in the previous 24 hours. Reporting for us tonight. Holly, thank you. The death toll is growing from a drug that is more dangerous than heroin. And a storm out of season causes havoc when the cbs evening news continues. I had so many thoughts once i left the hospital after a dvt blood clot. What about my wife. What were building together. And could this happen again . I was given warfarin in the hospital, but wondered, was this the best treatment for me . 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Both made switching to eliquis right for me. Dont let dust and allergies get between you and lifes beautiful moments. With flonase allergy relief, they wont. Most allergy pills only control one inflammatory substance. Flonase controls six. And six is greater than one. Flonase changes everything. Pelley doctors are sounding abalarm about an opioid that is so powerful one pill is enough to kill. John blackstone reports. Reporter the embrace of friends and the support of church is a comfort to Natasha Butler as she struggled to accept the recent death of her 28yearold son jerome. The doctor said that it was a Drug Overdose, and im looking at him like, Drug Overdose . Then he went to explain it to me. The pill . Reporter the pill that killed jerome butler, the father of three, contained a potent prescription pain reliever fentanyl. It shut down his organs. It shut down his kidneys. It shut down his liver, his brain was swollen. The doctor said there was nothing he could do. Reporter all that from one pill . From one pill. From one pill. Reporter her sons death was one of ten in the sacramento area in just 12 days that doctors have traced to fentanyllaced narcotics being sold on the streets as generic opioids. This is not a bathroom biochemistry. Its going to be very sophisticated. Sophisticated and deadly . Absolutely. Reporter dr. Timothy albertson is a toxicologist at u. C. Davis medical center. How powerful is fentanyl . Its probably 100 times more potent than morphine. D. E. A. Special agent john martin. Its coming from china, shipped to mexico, mexican Drug Trafficking organizations are then smuggling the fentanyl up through the traditional smuggling routes through the southwest border. Reporter Natasha Butler wants everyone to know pain pills president on the street can kill. How many more do we have to lose . Reporter and to imagine, one small pill. One. Reporter in just six months last year, scott, nationwide the d. E. A. 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They met on the courts when they were ten and quickly became friends. Then in 2007, turmoil in kriss household forced his birth mother felicia to make a tough decision. She wanted to find a more stable home for him. The britts stepped in and adopted him. House, and my oldest, so it was hard at the time, but because i knew who i was sharing him with, i was able to sleep at night. You know, he fit. It felt like not that there was a piece missing, but it only added more to our family. It made our family that much better. Reporter the boys breathed basketball. They played on the same High School Team in maryland. You know, to basically grow up and go through everything with a brother that hes going through the same workout that you are, you are doing everything together. So it definitely makes it easier. And dont let this selfie fool you. They took it saturday night when they knew they were headed for the championship, but they havent communicated since. Mom melody britt had a shirt made showing shes rooting for two teams tonight. Its a winwin. Villanova wins, we win. U. N. C. Wins, we win. I can see the love here. You have no idea. Matter who wins, the National Title stays in the family. Manuel bojorquez, cbs news, houston. Pelley and thats the cbs evening news for tonight. For all of us at cbs news all around the world, good night. Captioning sponsored by cbs access. Wgbh. Org the insider, counting down the biggest stories tracking today. Number one, dolly parton and katie perry dominate at the acm awards