Police called to the scene of the house party, in Rosyln, Wash., about 30 miles from the university, found young people – many of them women – passed out throughout the house and on the front lawn.
Police were immediately suspicious that drugs were involved, but interviews with the students and toxicology tests ruled out drugs, police said.
"Perhaps even more disturbing," said Chief Steve Rittereiser was that students were drinking beer and vodka in addition to Four Loko.
Attorneys general in New York and New Jersey have also called for federal investigations following incidents involving college students in those states.
"There's no redeeming social purpose to be served by having the beverage," Ramapo College President Peter Mercer told The Associated Press after he banned the drink on his campus when several students became sick.