"It's certainly a concern we have -- that the women were targeted moreso than the men for possibly nefarious reasons," said Rosyln-Cle Elum Police Chief Scott Ferguson. "The majority of the people affected by the drugs were females."
The 12 were rushed to the hospital early today after they were given drinks spiked with a strong drug and then overdosed, police told ABC Seattle affiliate KOMO-TV.
One young woman remained in serious condition today at Kittitas Valley Community Hospital, officials said.
Police took one young man into custody after he was found having sex with a young woman, but he was later released after it was determined she was his girlfriend and over 18, KOMO reported.
Police said it appeared that none of the people who overdosed meant to get high or unconscious, because none had more than one or two drinks.
"We don't believe this was just a result of heavy drinking," Ferguson said.
"We don't know for certain [what drug was used]. We've drawn blood at the hospital," Ferguson said. "We're suspecting it's some type of roofie or some type of ecstasy, but that's yet to be known."
"Roofie" is the street name for flunitrazepam, a sedative commonly referred to as the "date rape" drug.
Some of the students who attended the party said they, too, believed that the drug involved was roofies.
Chris Unger, a Central Washington University freshman, told KOMO that people started falling unconscious soon after he arrived at the party.