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A Wisconsin fraternity is under investigation by law enforcement after members allegedly used a color-coded system to slip date-rape drugs into the drinks of unsuspecting women, the Milwaukee Journal Sentinel reports

Three female students and one male student were sent to the hospital during the weekend of Sept. 13 after attending a party at the Tau Kappa Epsilon house at the University of Wisconsin-Milwaukee. Here's what happened, according to the search warrant affidavit obtained by the Journal Sentinel (emphasis ours): 

Officers were called to Sandburg Residence Hall about midnight Friday after a young woman was so drunk she could hardly stand.

A breath test showed her blood-alcohol level at 0.20 — more than twice the limit of 0.08 considered proof of intoxication in Wisconsin — and she was taken to Columbia St. Mary's Hospital. Officers noticed she had a red X on her hand.

Fifteen minutes later, officers were called to assist another severely intoxicated woman at the dorm. She, too, had a red X on her hand and was unable to speak clearly or walk.

The female students were allegedly marked with a red X and male students with a black X. As it turns out, the male student who ended up in the hospital drank from the wrong cup:

As officers helped that woman, a man vomited in a nearby trash can. The man, who had a black X on his hand, told police that he had been drinking at the Tau Kappa Epsilon house.

He had a female friend with him — who like the other women had a red X on her hand — and she said to get into the fraternity house they had to know someone inside. When they arrived at the party, they received a black or red X on their hand.

Only female guests could purchase an index card for $8. The index card provided "all access to the house" and the female guests could use it to get free alcohol from one of the bars in the house. The woman told police she had one or two drinks and gave the rest to the male friend. She was not taken to the hospital.

Students told police that members of the fraternity were preparing drinks out of sight — a no-no for any college student — and that some drinks appeared "cloudy." 

"One woman told police officers that a Facebook posting claimed Tau Kappa Epsilon had tried to 'roofie' women ... during an earlier party," Salon reports. "She recalled a fraternity member got upset when she went behind the bar to pour drinks and was physically removed," the Journal Sentinel reported. "She also told officers she had a 'weird feeling and sensation prior to blacking out.'"

One student was arrested and referred to the district attorney's office for possible charges. Tau Kappa Epsilon was also investigated in 2013 for three sexual-assault reports, although no charges were filed. 

The news comes on the same day that President Obama unveiled a new initiative to combat sexual assault on college campuses. Nice timing, Mr. President. 

h/t Gawker

Editors Note: Mar. 3, 2015 

An earlier version of this article failed to cite a passage from Salon in accordance with Mic editorial standards. The article has been updated to properly attribute the language to Salon.