LAS VEGAS -- Jon Jones struggled for words while his tears flowed. Frustration and fear were evident on his face.Although the man widely recognized as the worlds most talented mixed martial artist denied using any performance-enhancing substances, he couldnt explain the positive drug test that knocked him out of UFC 200s main event and threw his tumultuous career into crisis again.The UFC interim light heavyweight champion repeatedly cried at a hastily arranged news conference Thursday, a day after his rematch with Daniel Cormier was canceled.I would never take anything that would enhance my game, Jones said. Being labeled as someone who would ever cheat, it hurts me more than anything Ive ever been through in my career.Jones manager, Malki Kawa, said the fighter was informed of a possible PED violation by USADA, which administers the UFCs anti-drug policy. They hoped to get the results of a test of Jones backup sample later Thursday, although they have little hope the result will change.If the positive test is confirmed, Jones could face a multiyear suspension. Jones and Kawa declined to name the substance for which Jones was flagged, although Kawa said it could be related to a nutritional supplement.Jones said he cant even pronounce it. Ive never even heard of it.Jones said he has been taking the same supplements for most of his career, and he has no idea why he failed last months test after passing seven doping tests this year. Although Jones had endured numerous public embarrassments over his apparent use of recreational drugs, he has been a vocal opponent of performance-enhancing substances in MMA.You can say whatever you want about Jon over the years, Kawa said. For the last year, hes done nothing but try his best to live his life right, to eat right, to do the right things, and obviously not to be in this type of predicament. ... He didnt cheat at all.USADA spokesman Ryan Madden confirmed the potential violation stemmed from an out-of-competition test on June 16.Mr. Jones B-sample is currently being analyzed by the independent WADA-accredited laboratory in Salt Lake City, Utah, Madden said. We have requested that the laboratory report those results to us as soon as possible.No matter the results of the second test, Brock Lesnars heavyweight bout with knockout artist Mark Hunt is UFC 200s new main event. While fans arrived at T-Mobile Arena to watch open workouts for Hunt and Lesnar, workers tore down oversized posters of Jones and Cormier on the facade.Lesnar, the popular professional wrestler returning from a 4 1/2-year UFC absence, also was the headliner at UFC 100 in 2009, with Jones fighting on the undercard.I feel a little bad for (Cormier), Lesnar said. Guys go hard. They go through training camps and put lots of time in, and thats where D.C. really gets the short end of the stick. Its really unprofessional of anybody of this caliber when something like that happens.Jones (22-1) briefly left the stage at his news conference after being overcome with emotion. Several minutes later, he broke down when asked what he would say to Cormier, his longtime rival and frequent verbal sparring partner.I know this fight meant a lot to him, Jones said. The fight meant a lot to me. ... I know some good will come from this, but right now its hard to see it.Jones talent is indisputable after winning the 205-pound title in 2011 and defending it eight times. But he has endured numerous troubles of his own making in recent years.He has failed drug tests around two of his last three fights. He tested positive for cocaine use shortly before beating Cormier in their first meeting in January 2015, but was allowed to fight because the detected metabolite was not banned for out-of-competition use by the Nevada Athletic Commission.A few months later, Jones was suspended by the UFC and had his title stripped due to his involvement in a hit-and-run accident in Albuquerque, New Mexico, where he lives and trains.Cormier won the 205-pound title during Jones UFC suspension, which was lifted in October 2015. After Cormier pulled out of their scheduled April rematch with a foot injury, Jones returned with a victory over Ovince Saint Preux.Jones, who turns 29 later this month, realizes he could have another extended absence from his sport. He has fought just three times since September 2013.If I do have to sit out for two years, Ill definitely be back, Jones said. Im already thinking about the good that can happen. I try to stay optimistic. 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It says Pocklingtons lawyer filed the appeal Friday in a California court. CTV Edmonton also says Pocklington gave a $100,000 cash deposit as part of the conditions of his bail, and that he will be out on bail until his appeal is heard.NRL star and former San Francisco 49ers player Jarryd Hayne has been caught in an embarrassing pornography gaffe while presenting an online safety talk at a high school on Australias Gold Coast.Haynes online browsing history was being shown on a screen at the school, featuring mostly sports images, when a pornographic website was displayed on the screen to the 200-plus students in attendance at Robina State High School.Norton Security, on whose behalf Hayne was presenting the talk, said afterwards the images had come from another device that had entered the network.Its unfortunate and all I can say [is] it definitely was not Jarryds device, Haynes co-host from Norton, Nick Savvides, said. Connecting to open networks, people can see what youre doing and in this case, inject unwanted materials.Hayne was shocked by the appearance of the images, which remained on the screen for a number of seconds and included lewd acts and a topless woman.dddddddddddd.It was [awkward], he said. I shut my phone straight away so that way I was logged off. Wow.Its not believed Hayne was due to give any further talks at other schools.The demo has been shown before at a number of talks elsewhere without Hayne and Mr Savvides claimed such an issue had not arisen before. He also said they would be unable to ascertain exactly whose device the website had come from.Hayne, the former Parramatta Eels player, returned to Australia earlier this year after a stint in the US playing for the 49ers in the NFL and an unsuccessful attempt to make the Rio Olympic Games with the Fiji rugby sevens team. ' ' '