CONI said it was informed by the International Olympic Committee that Frullani came up positive for the banned stimulant dimetylpentylamine in a test taken in the Olympic Village on Tuesday. Frullani asked for a backup test that was taken Friday and "confirmed the positive result, resulting in his exclusion from the Italian delegation," CONI said.
Dimethylamphetamine is classified as a "specified stimulant" on the World Anti-Doping Agency's prohibited list. Specified stimulants cover drugs that are more susceptible to inadvertent use and can carry reduced penalties.
CONI told The Associated Press that it believed Frullani purchased the stimulant on the Internet from the United States, since it is not available in Italy.
Samuele Romanini will replace Frullani as the brakeman for the four-man bobsled race, which begins Saturday.
CONI said Frullani is a former decathlete.