The woman's statement was recorded and her clothes, which she wore on the day of the alleged crime, were recovered and sent for forensic examination, sources said.
An additional SP (name not disclosed) of CID-Crime Branch has been given the task to probe the case, they said.
The Sodala Police station has booked minister of state for dairy, khadi and rural industries (Independent charge) Baulal Nagar for allegedly raping, threatening and beating up a 35 year-old woman on September 11, after calling her to his official bungalow in Civil Lines on the pretext of giving her a job.
After registering the case under various sections of the IPC including 376, police referred the case to CB-CID as it involved an MLA of the present Assembly.