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Adelman is currently on administrative leave, and the L.A. Times is reporting that the person being investigated is Adelman.
Police said a woman came forward on July 10 and said she had been in downtown Los Angeles, had several drinks and blacked out. When she woke up, she was allegedly being sexually assaulted by a person she later identified as Adelman.
Adelman has not been charged with any crime and has not been arrested.
L.A. Mayor Antonio Villaraigosa released a letter about the investigation.
"It has recently come to my attention that you are the subject of an ongoing investigation by the Los Angeles Police Department. You are being placed on administrative leave effect immediately. Please be reminded that your employment is at will and may be terminated at any time," the statement says.
The police department and Villaraigosa are being very careful about what they say about the case.
"I don't want to in any way prejudice what's going on on the criminal side," Villaraigosa said.
"I am putting him on administrative leave because i believe it's in the best interest of the city of Los Angeles under the circumstances."