Rape charges have been dropped against Juan D Contreras, who is from Greely, Colorado. He was accused of spiking a student's drink and then raping her

Rape charges have been dropped against an alleged illegal immigrant who was accused of raping a female student in a dorm room at the University of Missouri - Kansas City.

Juan D Contreras, who is from Greely, Colorado, was charged in March of spiking a student's drink and then raping her.

On Monday prosecutors dismissed the case after deciding there wasn't enough evidence to find the 22-year-old guilty.

Michael Mansur, a spokesman for the Jackson County Prosecutor's Office, told the Kansas City Star the decision was made after lengthy discussions with the victim and witnesses.

'We determined we would not be able to meet our burden of proving the case beyond a reasonable doubt at trial,' Mansur explained.

He said that UMKC police have been notified of the decision.

The attack allegedly happened on February 23 at Johnson Hall (pictured) on the University of Missouri- Kansas City's campus

Contreras, who isn't a student at the university, was released from jail on Tuesday.

According to multiple reports he is an undocumented immigrant, so he may have been taken into federal custody following that release.

The attack allegedly happened on February 23 at Johnson Hall on the university's campus.

The victim told police she doesn't remember anything that happened after consuming a drink Contreras bought for her.

Contreras was allegedly seen carrying the unconscious victim to her dorm room that evening.

She said she remembers waking up and noticing that her clothing had been removed.

According to court documents, when she asked Contreras what happened, he told her they had sex.

When the story became public students protested the university's initial response for being too slow, in addition to the school's sexual assault policies.