Los Alamos police discovered a cache of what they believe to be a drug that can be used to commit date-rape at the home of a relative of one of the men charged in an alleged gang rape last weekend, according to court documents.

The 96 brown vials of suspected of gamma hydroxybutyric acid — known as GHB — found at the home of David Ellenberg's sister matched an empty brown vial found at the home of the victim where the rape allegedly occurred, according to a search warrant affidavit filed Thursday in state District Court.

The victim's boyfriend told police that Ellenberg, 23, Kyle Goss, 17, and another man came over to the couple's Los Alamos home Friday night for a barbecue. The boyfriend left about 10 p.m. to attend to house-sitting chores at a home in White Rock, another search warrant affidavit filed Thursday says.

At 1:23 a.m., the boyfriend received a phone call from his girlfriend saying she needed help. The boyfriend hurried back to the home and found Ellenberg and Goss naked coming out of a bedroom, the affidavit says. The boyfriend asked Ellenberg what happened and Ellenberg said, "I don't know," according to the affidavit. He found his girlfriend wearing only her underwear, throwing up in the bathroom and groggy.

A sexual assault nurse found signs of assault, while a narcotics expert told investigators that both the girlfriend's behavior and the brown vials were consistent with GHB, the affidavit states. GHB can cause drowsiness, nausea and dizziness in lower doses and has been used in the commission of sexual assaults because "it renders the victim incapable of resisting ..." according to the U.S. Drug Enforcement Agency Web site.