SOCHI, Russia -- A top German biathlete and an Italian bobsledder were kicked out of the Sochi Olympics on Friday in the first doping cases of the Winter Games. Former two-time Olympic gold medallist Evi Sachenbacher-Stehle tested positive for the stimulant methylhexanamine in both her "A" and "B" samples, the German Olympic Committee said. The committee said she has been removed from the team and was being sent home. Sachenbacher-Stehle -- winner of two golds and three silvers in cross-country skiing at previous games -- blamed the positive test on a nutritional supplement and said she had never knowingly taken performance-enhancing drugs. "I am going through the worst nightmare that you can imagine, because I am unable to explain at all how there could be a positive test," she said in a statement. The Italian Olympic Committee, meanwhile, announced that bobsledder William Frullani was ejected from the games after testing positive for the banned stimulant dimetylpentylamine in the athletes village on Tuesday. Frullani, who had not competed yet, asked for a backup test that "confirmed the positive result, resulting in his exclusion from the Italian delegation," CONI said. The IOC declined to comment, citing confidentiality of ongoing anti-doping procedures. Sachenbacher-Stehle, who switched from cross-country to biathlon two years ago, competed in five events in Sochi but did not win any medals. Her best results were two fourth-place finishes, in the 12.5K mass start and the mixed relay. The 33-year-old German was tested after Mondays mass start race. Her backup sample was tested on Friday and confirmed the original finding. Her expulsion from the games was announced after she appeared before an IOC disciplinary commission on Friday afternoon. Sachenbacher-Stehle had been left off Germanys top-ranked womens relay team before Friday nights 4x6-kilometre relay. The team finished 11th. Franziska Hildebrand, who skied the third leg for Germany, said the team was told about the doping case earlier in the day. "We are totally shocked," Hildebrand said. Methylhexanamine is classified on the World Anti-Agencys prohibited list as a "specified stimulant," a group of substances that are more susceptible to inadvertent use and can carry reduced penalties. Sachenbacher-Stehle said she had her nutritional supplements checked in a lab or cleared by the manufacturer before the games. "At the moment I can only assure all involved that I never knowingly took banned substances," she said. Any further sanctions outside of the Olympics are up to the International Biathlon Union. The German could face a ban from the sport for a year or more. Michael Vesper, chief of German Olympic body DOSB, said athletes have been repeatedly warned about supplements that contain methylhexanamine. "The DOSB strives for a doping-free sport and a zero tolerance policy," he said in a statement. "We strive only for cleanly achieved performances. Every doping case is first of all a big disappointment. But it is also proof that that control system works." Stefan Schwarzbach, spokesman for the German biathlon and cross-country teams, said a contaminated supplement is a possible explanation for Sachenbacher-Stehles positive test. "We are not sure if its really from an unproven, or dirty, supplement," he said. " We really dont know." "It really seems that it is a mistake," Schwarzbach added. "And she has to handle the consequences." As a cross-country skier, Sachenbacher-Stehle won gold medals in the team sprint at the 2010 Vancouver Olympics and 4x5K relay at the 2002 Salt Lake City Games. She won silver medals in Salt Lake, Vancouver and at the 2006 Turin Games. The only previous German athlete sanctioned for doping at a Winter Olympics was hockey player Alois Schloder, who was disqualified from the 1972 Sapporo Games after a positive test for ephedrine. German-born cross-country skier Johan Muehlegg was competing for Spain in 2002 when he was caught doping and stripped of one of his three gold medals at the Salt Lake City Olympics. In the Italian case, CONI told The Associated Press that it believed Frullani, a former decathlete, purchased the stimulant on the Internet from the United States, since it is not available in Italy. Dimethylamphetamine is also classified as a "specified stimulant" on the WADA list. Samuele Romanini will replace Frullani as the brakeman for the four-man bobsled race, which begins Saturday. The IOC is conducting 2,453 drug tests in Sochi, a record for the Winter Games. 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Where the rookies should sit on the team plane. And please think twice before sending that picture out on Twitter.Its all the stuff you dont really think about but you need to know, said infielder Sean Coyle, a 22-year-old Red Sox prospect who spent last year with Double-A Portland. Its what really goes on when you get called up to the big leagues. You think its a magical experience, but it takes hard work.To learn all this, the Red Sox sent their prospects to Harvard for the week — not to sit in a classroom, but because the school has a bubble at its century-old football stadium where they could work out. Players ran sprints, played long toss and stretched out under the inflated dome that protected them from the Boston winter.They also got a chance to hear from Red Sox manager John Farrell and other members of the coaching staff, and to learn what would be expected of them if they get the call. There were also presentations from general manager Ben Cherington and team chief operating officer Sam Kennedy; from members of the medical and media relations staff; from the clubhouse attendants and travelling secretary; and from veteran players.Left-hander Brian Johnson said much of the advice he received was common sense, but it was helpful to hear a reminder from those who had been through it. Among the things that stood out for him was listening to former Red Sox catcher Jason Varitek describe how he would prepare for games.Johnsson, who was 13-3 in Single- and Double-A last year, said the players were told to think of themselves as the CEO of their own company.dddddddddddd represent myself, my parents, my family, he said. You can ruin it all by just hitting the send button.The program included two baseball workouts a day but also visits to the Jimmy Fund, a cancer charity long-affiliated with the Red Sox, and to a local school to paint murals. Ten players took part in the camp, including 27-year-old Rusney Castillo, who joined the organization from Cuba and played 10 games with the Red Sox last September, and rookie phenom Mookie Betts.Ben Crockett, the Red Sox director of player development, said even the players who have already made their major league debuts could benefit from the talks.Maybe theres something they saw and didnt ask because they were a rookie, he said. This is a safe environment for that.Crockett said the goal is to help players focus as much as they can on the things they can control on the field.Theres different things to be aware of, he said. The general things didnt change.The team has held such sessions for the past 10 years, and it has only become more important as social media proliferates — and with it the opportunities to find trouble. Other teams hold similar camps, often patterned on an off-season program started by Major League Baseball.Blake Swihart, 22, spent most of last season in Double-A and has been rated the No. 1 prospect in the Red Sox system. He said players were reminded that being a member of the team carries a responsibility.Everywhere you go in the city, people are going to know you, he said. Everyone knows whats right and wrong. Be professional. ' ' '