BEVERLY HILLS, Calif. -- Bob Costas and other top members of NBCs Olympics coverage team veered between optimism and caution in predicting Rio de Janeiros ability to pull off a successful Summer Games and said NBC will cover the good and bad.Other Olympics have taken place without significant difficulties and he hopes it will be the same for Rio, Costas said Tuesday. But he then ticked off the daunting list of challenges faced by the Brazilian city.It would be naive to think it isnt grappling with security worries, pollution and political turmoil along with a deep recession thats occurred since Rio won the Games, Costas said.He spoke to TV critics from Rio by satellite, along with executive producer Jim Bell and correspondent Mary Carillo. The opening ceremony airs Friday on NBC, which is carrying the games on the air and online.Whether any city can carry off the immense event is the question heading into virtually every Olympics, Bell said. Then the athletes arrive, the Olympic torch is lit and that is the story the network tells, he said.But if a host city falls short, he said, then NBC should focus on that.Costas said that any security issues or ill effects from contaminated water will be immediately apparent and have to be addressed. So far, the best advice given athletes competing in open-water sailing or swimming events is to close their mouths and keep their heads above water, he added.I guess some new techniques will be required, Costas said, sarcastically, adding, Im not trying to be facetious here, but its going to be impossible, in some cases, not to address some of the issues that have come up before the Olympics, because they will directly (effect) the competition.Many open-water competition test events have been held and resulted in zero problems so far, Bell said.When Carillo chimed in that she will be helping to cover those contests, Costas asked her if she planned to take a dip yourself.Absolutely not, she replied. She added, however, that shes been told that open-water swimmers in the 2012 London Olympics faced dirtier conditions from goose droppings in Hyde Parks Serpentine lake.According to a 16-month-long study commissioned by The Associated Press, the waterways of Rio de Janeiro remain as filthy as ever just days before the Games begin and are contaminated with raw human sewage teeming with dangerous viruses and bacteria.If illness or other crises arise, does NBC bear some responsibility for what happens because of the large license fee it pays to the International Olympics Committee, the NBC team was asked.I dont think so, Bell replied.Costas expanded on that answer, saying that the Rio Games would happen without NBCs involvement. The argument could be made that the IOC should have considered moving or postponing it, given the problems that began emerging months ago, he said.But once the games were being held, the network that owned the rights to televise those games was going to televise them, Costas said, adding that the question about network responsibility becomes how thoroughly and credibly do we cover it.His expectation is that NBC Sports and NBC News will not shy away from that, Costas said.Asked if NBC could have used its financial-stake clout to influence the IOC, Bell said he didnt think so.You could make the case Zika is a bigger story in Florida than in Rio, where it is winter, and cooler and drier, he said. Is Disneyland responsible for bringing people to Florida? Custom Andre Dawson Jersey . They had already blown a double-digit lead, fans were hitting the exits, and a long seven-game road trip waited at the end. 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NAIROBI, Kenya -- Prosecutors in Kenya withdrew doping charges against banned marathon runner Rita Jeptoos former manager on Tuesday, saying they wanted to conduct more investigations.Federico Rosa, an Italian national, had been facing charges that he provided or administered banned substances to Jeptoo and another little-known Kenyan runner, with some of the allegations dating back as far as 2004.Rosa said he had been given back his passport by a court in Nairobi and was free to go. He had been out on bail ahead of Tuesdays court hearing.There is no witnesses. There is nothing against me. There is no case. This is one of the best days of my life, Rosa told The Associated Press in a phone interview.Rosa was freed, but prosecutors said they would investigate further and he could be re-arrested and re-charged.Prosecutors had said that Rosa was complicit in Jeptoos doping in 2014, when he was her manager. Jeptoo, once the leading womens marathon runner in the world, tested positive for EPO in an out-of-competition test that year. She was initially banned for two years, but her punishmeent was doubled to four years by the Court of Arbitration for Sport last month.dddddddddddd That CAS ruling also appeared to vindicate Rosa, with the Swiss-based court noting in its findings that Jeptoo had hidden her doping from her management and coaching team at the time.Rosa ended his association with Jeptoo after she failed the doping test.Although Jeptoo was named as a complainant by prosecutors in the Kenyan criminal case, Rosa disputed that his client had ever accused him of involvement in her doping.Charges that Rosa helped administer banned substances to Elijah Kiprono Boit, a former 800-meter runner who competed at the world youth championships in 2001 and 2004, were also dropped. Rosa was accused of helping Boit dope between 2004-08.Rosa represents a number of top Kenyan athletes, including three-time world 1,500-meter champion Asbel Kiprop and Olympic marathon champion Jemima Sumgong. Kiprop attended Tuesdays court hearing in support of Rosa. ' ' '