In ukraine, while his country was at war, the leaked documents indicate, president Petro Poroshenko moved his business fortune to the British Virgin island to avoid paying taxes. And british Prime MinisterDavid Cameron facing question as but his fathers offshore investments. Michael hudson among the recorders studying the documents for months. And the paperwork makes it clear that they wanted it structured in a way that the profits from these investments would not be taxed in the uk. A specialist, the leak reveals Money Laundering schemes, sanctions busting and other crimes. Former treasury officer, chip poncy. Every one of these devastating types of harms relies on Financial Support infrastructure that is often serviced by what you see in the panama papers. Reporter the documents show how Close Associates of vladamir putin allegedly ran a multibillion dollar Money Laundering ring through bank rossiya subject to u. S. Sanctions after russia annexed crimea. And syrias government circumvented sanctions using Shell Companies in the seychelles. In an interview with panamanian tv station, Ramon Fonseca said they have never been found guilty of anything in 40 years of business. We are a knife factory, he says, that sells knives. If the knife its used for a murder, we are not responsible. So far, no american politicians or come pans have been named. But there are other investigations already under way around the globe, scott. Including australia, germany, the netherlands and france. Awful this just beginning 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. Holly williams is following this. Reporter the migrants were bused into lesbos port before dawn and behind lines of riot police. Each person being sent back had a chaperone. And we captured proof that their wrists were bound while on board the buses. The greek authorities said none of the migrants had aplid fplie asylum in europe. Thousand of other people in greece at risk of deportation have fled war in syria and iraq. And they risked their lives to cross from turkey to greece in rickety boats and inflatable rafts. Greeces refugee camps have now become Detention Centers. Fenced in 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 it is safe. But the greek Police Quickly intervened. He wants to speak to us, why cant we and then ended our interview. Some migrants havent been able to contain their frustration in recent days. Several hundred people even managed to barack out of the Detention Center on the island of chias. If you are seeking asylum. You are not committing a crime. 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 protect thags deserve. They have to be given an individual process so they can explain why they have to stay because they fear for their lives. Reporter the question now is whether locking migrants up and deporting some of them actually stops others from coming. There has been a drop in numbers in the last few days. But scott, this morning the greek government said that more than 300 people had arrived in the previous 24 hours. Holly williams 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. Cbs overnight news will be right back. Degree motionsense. 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The pill reporter the pill that killed Jerome Butler father of three contained 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, said there was nothing he could do for him. 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 12 days. Doctors have traced to fentanyl laced narcotics sold on the streets as generic opioids. This is not bathroom biochemistry very sophisticated. Reporter and deadly. Absolutely. Reporter dr. Timothy albertson is toxicologist at uc davis medical center. How powerful is fentanyl . 100 times more potent than the morphine. Dea special agent john martin. Coming from china, manufactured in china. Shipped to mexico. Mexican drug trafficicing organizations are struggling the fentanyl through smuggling routes through the southwest border. Reporter Natasha Butler wants everyone to know pain kills bought on the street can kill. How many more are we going to lose . Reporter to imagine one small pill. In just six months last year, scott, nationwide, the dea seized enough illegal fentanyl to make more than 166 million doses of the drug. John blackstone in californias capital. John, thanks very much. A volcano puts on a spectacular show. Well have that when we come back. Joe medicine crow was a u. S. And native american hero. Born on the Crow Reservation in montana, a great uncle told him firsthand, about the battle of the little big horn. In world war ii, medicine crow fought behind german lines. In one raid stole 50 german horses. He was awarded the president ial medal of free doidom in 2009. He died sunday, 102. A volcano 50 miles from mexico city has been rumbling. Yesterday it blew, sending ash, rock and smoke more than a mile high. Folks who live nearby have been warned they may have to evacuate. Winter made a comeback today with freezing temperatures and snow in the northeast. Driving was next to impossible in buffalo. With whiteout conditions. A tour bus carrying College Students flipped in the adirondacks, but no serious injuries. Two of baseballs opening day games were postponed. Two wet in new york. Too cold in cleveland. Up next, a court battle pitting, the ncaa Basketball Championship will be decided tonight. The game between the university of North Carolina and villanova will feature some serious sibling rivalry. Manuel bojorquez is in houston. Fires reporter the university of North Carolinas nate britt and villanovas kris jenkins are brothers from other mothers literally. They met on the courts when they were 10 and quickly became friends. Then in 2007, turmoil in kris household forced birth mother fleesh felicia to make a tough decision. 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 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 he is going through the same workouts that you are, you know, doing everything together. So, it definitely makes it easier. Reporter and dont let this selfie fool you. They took it saturday night when they knew they were headed for the championship but havent communicated since. Mom melody britt had a shirt made showing she is rooting for two teams tonight. Its a winwin. Villanova wins. We win. Unc wins, we win. Reporter i can see the love here. Uhhuh. You have no idea. Reporter tonight no matter who wins the National Title stays in the family. Manuel bojorquez, cbs news, houston. Thats the cbs overnight news for this tuesday. For some of you the news continues. For others check back with us a little bit later for the morning news and cbs this morning. From the Broadcast Center in new york city, im scott pelley. Announcer this is the overnight news welcome to the overnight news im michelle miller. Another important stop on the road to the white house. As wisconsin holds its primary. Bernie sanders is trying to claw his way back into the democratic race against Hillary Clinton. Polls show him with a twopoint lead in wisconsin. For the republicans, ted cruz is out front with 43 . Donald trump second with 37 . John kasich is third. Major garrett has more. Looking at our wisconsin poll, donald trump says he is tied with ted cruz. But that is statistical guess work against the combined get out the vote efforts of cruz and wisconsin Governor Scott walker. Thats a harsh political reality. One trump tried to deal with yesterday by essentially apologizing for most of last week. I dont know that they has been the worst week mine campaign. Reporter on tv and in print, donald trump did the unthinkable and unusual. He expressed regret. He told the New York Times columnist maureen dowd that retweeting ted cruzs wife heidi was a mistake. Was this my best week, i guess not. Could have done without the retreat, et cetera. Trump attempted to clarify comments he made about punishing women who seek abortions. Well. As a hypothetical question i would have rather asked, answered it in a different manner, yeah. Reporter on face the nation, trump stated the obvious about where things stand. But searched for an answer about what abortion is. At this moment the laws are set. And i think we have to leave it that way. Do you thing it is murder, abortion . Um, i have my opinions on it. But i would rather not comment on it. Reporter ted cruz quoted pundits opposed to abortion the who he said now rightly question trumps core beliefs. Donalds answers are the answers of some one who is a liberal. Trying to stay what he thinks conservatives want to hear. Later sunday trump insist heed had been misunderstood. I took the answer. I didnt like it. A lot of people didnt understand it. Will gone through a lot. They go through a tremendous punishment of themselves. I didnt like it because i wasnt sure people would understand it. So i clarified it. Reporter trump is battling to win wisconsins 42 delegates. Says john kasich running third is comb ply kagt the efforts. A complicating the efforts. Kasich has more of an impact on me than he does on cruz in my opinion. The Republican National committee has no power to remove any candidate from the race. And there was a time when trump liked all of the vigorous competition. Kasich for his part is now drawing fire in terms of tv ad and negative mailers from cruz. Proof that kasich support while small could be pivotal here. For the democrats both Bernie Sanders and Hillary Clinton are already looking ahead to the New York Primary in two weeks. And they are bickering about their next debate. Nancy cordes reports. Im not the one negotiating it. Going on between our campaigns. I know my campaign has been really trying. The biggest argument between clinton and sanders this weekend wasnt wall street or health care it was about schedule a debate here in new york. Doing it during the ncaa finals, whatever, makes no sense doing it in the morning. When people are not going to be watching in large numbers. Makes no sense. Sunday, the Sanders Campaign accused its rival of proposing a debate on a night he has a big rally. The Clinton Campaign said the sanders camp needs to stop with the games. Accusing it of using fake excuses to attack her on the issue. Thank you all very much. Wisconsin votes and both campaigns say sanders could rack up his fourth straight victory. The staying power means clinton has gotten hammered from the left longer than she expected. As secretary of state she actively supported fracking around the world. Clinton argued sanders is distorting her record. I have been work iing to tryo move us away from fossil fuels many years. Reporter last year it wasnt republicans raising the fbi investigation into clintons server, it was sander supporter and actress Rosario Dawson introducing him in the south bronx. Yes, she is under fbi investigation, thank you. Sanders defended dawson sunday but insisted he is staying away from the topic. A lot of people say bernie why dont you go after her on her fbi investigation . Why dont you go after her on the Clinton Foundation money . We have chosen not to do that. The clinton camp argues comments like that are his way of highlighting the topics without really talking about them. Outrage is growing around the world as reporters pour through a massive release of sensitive documents called the panama papers. News organizations were emailed millions of documents purportedly detailing shady Financial Transactions of some of the worlds richest people and most powerful politicians. In iceland for instance thousand protested, outside parliament, the demanding the countrys Prime Minister resign. He has been linked to an offshore Shell Company allegedly involved in a massive tax evasion scam. He is not alone. Don dahler has more. Its not illegal to have an offshore company. But one purpose of a socalled Shell Company is that money put it in it cant be traced to its owner. The practice allows people to hold cash and move cash under a corporate name without International Law enforcement or tax authorities knowing who it belongs to. An anonymous source provided nearly 40 years worth of documents from a law firm in panama, Mossack Fonesca that helps establish offshore accounts for the wealthiest people. 2. 6 terabytes handed over to journalists reportedly contains 11. 5 million documents. Including 5 million internal emails providing a window into some 214,000 companies. This really told us something about how the offshore Financial System works and who are the kind of people using it. Michael hudson is one of hundreds of journalist whose researched the documents in likely the biggest leak of inside information in history. The same system that, that politicians and the mega wealthy and billionaires are using to move money and do transactions is being used by criminals, ponzi schemers, drug kingpins. You name it. To hide their corrupt businesses. Among the 12 current or former heads of state named in the investigations, the president s of ukraine and argentina, and the king of saudi arabia. And while he is not named directly, the documents show allies to russian president vladamir putin secretly shuffled as much as 2 billion through banks and shadow companies. The Prime Minister of iceland who rose to prominence after the countrys financial crisis walked out of an interview last month when skegs add but his ownership of a Shell Company that held nearly 4 million in bonds in the three major icelandic mix. Secrecy is bought and sold. Costs money. The more secrecy, the more you pay. Mossack fonesca called the leak a crime and stressed to the french press that we have no responsibility in how the companies were used. They say they are like a car factory. You cant blame the car factory you cant blame the car factory if a car is used to rbob a theres moving. You cant blame the car factory if a car is used to rbob a. And theres moving with move free ultra. It has tripleaction support for your joints, cartilage and bones. And unlike the big osteobi flex pills, its all in one tiny pill