TRUCKEE, Calif. — Many partygoers who were with Kiely Rodni the night she vanishedare refusing to cooperate with investigators — because they’re afraid they could get charged over “illegal activity” and then kicked out of college, California authorities said.

“People aren’t talking to us,” Placer County Sheriff’s Office public information officer Angela Musallam told The Post Thursday, adding that although some have come forward, many are staying silent.