BEIJING, Feb 11 (Reuters) - The drug scandal engulfing 15-year-old Russian figure skater Kamila Valieva is inhumane and the adults responsible should be banned forever, skating legend Katarina Witt said. "What they knowingly did to her, if true, cannot be surpassed in inhumanity and makes my athlete's heart cry infinitely," said Witt, an Olympic champion in 1984 and 1988. Valieva on Monday won Olympic gold with her Russian team mates, but it was revealed on Friday that she had earlier failed a drug test. The 15-year-old's gold medal and Games future now hangs in the balance as the International Olympic...