Pullman Police did not find enough evidence to continue the investigation into an incident in which three college women were allegedly drugged at WSU’s Delta Upsilon fraternity house in September.

Cmdr. Chris Tennant said the women reported experiencing significant effects which did not match up with the amount of alcohol they consumed, leading them to believe they had received date rape drugs.

One of the women gave a urine sample at Pullman Regional Hospital, which was sent to the WSU Crime Lab for testing. The results came back last week as negative, but Tennant said he does not believe the fraternity is completely off the hook.

He said the advantage to date rape drugs for predators is that the drugs are difficult to detect if the type is unknown. The drugs also pass quickly through the body, and police do not know the time frame between when the victims received the drugs and when the woman was tested at the hospital.

Though he said the investigation is closed because of lack of evidence, the department is unsure of whether the women were drugged.

“Bottom line,” he said, “we honestly don’t know.”

The department is also continuing a rape investigation at the same fraternity on the same weekend. Tennant said no arrests have been made and they are trying to work with surveillance footage to match up stories from the incident.

Reporting by Katie Shadler