 Complete the following phrase:  Yefimovas participation in the 2016 Summer Olympics was controversial in light of an ongoing scandal of doping within the Russian Olympic Team. She was initially banned from participation due to her previous doping suspension, but this ban was overturned by the Court of Arbitration for Sport, allowing her to compete. During the Games, she was booed by spectators during each of her races. Yefimova was also criticized for taking performance-enhancing drugs by other swimmers, including Lilly King, who won the gold medal in the 