The Central Bureau of Investigation (CBI) is likely to give former Uttar Pradesh minister Raghuraj Pratap Singh alias Raja Bhaiya a clean chit in the murder case of Kunda Deputy Superintendent of Police Zia-ul-Haque, sources said today. Sources said Raja Bhaiya has cleared a lie detector test conducted on him by the CBI, which will also submit its results along with the probe report in a court in Lucknow today.