A Washington state police officer has been charged with sexually assaultinga fellow officer after she passed out at a party, authorities said.

Sgt. Gordon Ennis of Spokane Police Department turned himself in Wednesday and was booked on second-degree rape charges, according to The Spokesman-Review. He was released minutes later.

His arraignment is scheduled for Monday.

The female officer told investigators she consumed several drinks at an October party thrown by another Spokane officer. She vomited and then went to sleep it off in a guest room at the host’s house, she said.

She awoke to find Ennis sitting next to her on a bed, with his fingers penetrating her, she said.

He abruptly left, she said.

“The victim is very strong, and has great resolve to see this through to the end,” said Spokane County Sheriff Ozzie Knezovich, KREM-TV reported.

Court documents say Ennis trimmed his fingernails to avoid the collection of DNA evidence, the station said. He was placed on paid leave after the alleged incident.

Other officers are being investigated for possibly compromising the investigation, authorities said.

“This is a disappointing day for Spokane. We hold our police officers to the highest standards of conduct, and the allegations contained in these charges fall far short of those expectations,” said Spokane Mayor David Condon.

*Photo showsSgt. Gordon Ennis.